chore(deps): update dependency pillow to v8 (#65)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [pillow](https://python-pillow.org) ([source](https://togithub.com/python-pillow/Pillow)) | major | `==7.2.0` -> `==8.0.0` |

---

### Release Notes

<details>
<summary>python-pillow/Pillow</summary>

### [`v8.0.0`](https://togithub.com/python-pillow/Pillow/blob/master/CHANGES.rst#&#8203;800-2020-10-15)

[Compare Source](https://togithub.com/python-pillow/Pillow/compare/7.2.0...8.0.0)

-   Drop support for EOL Python 3.5 [#&#8203;4746](https://togithub.com/python-pillow/Pillow/issues/4746), [#&#8203;4794](https://togithub.com/python-pillow/Pillow/issues/4794)
    [hugovk, radarhere, nulano]

-   Drop support for PyPy3 &lt; 7.2.0 [#&#8203;4964](https://togithub.com/python-pillow/Pillow/issues/4964)
    [nulano]

-   Remove ImageCms.CmsProfile attributes deprecated since 3.2.0 [#&#8203;4768](https://togithub.com/python-pillow/Pillow/issues/4768)
    [hugovk, radarhere]

-   Remove long-deprecated Image.py functions [#&#8203;4798](https://togithub.com/python-pillow/Pillow/issues/4798)
    [hugovk, nulano, radarhere]

-   Add support for 16-bit precision JPEG quantization values [#&#8203;4918](https://togithub.com/python-pillow/Pillow/issues/4918)
    [gofr]

-   Added reading of IFD tag type [#&#8203;4979](https://togithub.com/python-pillow/Pillow/issues/4979)
    [radarhere]

-   Initialize offset memory for PyImagingPhotoPut [#&#8203;4806](https://togithub.com/python-pillow/Pillow/issues/4806)
    [nqbit]

-   Fix TiffDecode comparison warnings [#&#8203;4756](https://togithub.com/python-pillow/Pillow/issues/4756)
    [nulano]

-   Docs: Add dark mode [#&#8203;4968](https://togithub.com/python-pillow/Pillow/issues/4968)
    [hugovk, nulano]

-   Added macOS SDK install path to library and include directories [#&#8203;4974](https://togithub.com/python-pillow/Pillow/issues/4974)
    [radarhere, fxcoudert]

-   Imaging.h: prevent confusion with system [#&#8203;4923](https://togithub.com/python-pillow/Pillow/issues/4923)
    [ax3l, ,radarhere]

-   Avoid using pkg_resources in PIL.features.pilinfo [#&#8203;4975](https://togithub.com/python-pillow/Pillow/issues/4975)
    [nulano]

-   Add getlength and getbbox functions for TrueType fonts [#&#8203;4959](https://togithub.com/python-pillow/Pillow/issues/4959)
    [nulano, radarhere, hugovk]

-   Allow tuples with one item to give single color value in getink [#&#8203;4927](https://togithub.com/python-pillow/Pillow/issues/4927)
    [radarhere, nulano]

-   Add support for CBDT and COLR fonts [#&#8203;4955](https://togithub.com/python-pillow/Pillow/issues/4955)
    [nulano, hugovk]

-   Removed OSError in favour of DecompressionBombError for BMP [#&#8203;4966](https://togithub.com/python-pillow/Pillow/issues/4966)
    [radarhere]

-   Implemented another ellipse drawing algorithm [#&#8203;4523](https://togithub.com/python-pillow/Pillow/issues/4523)
    [xtsm, radarhere]

-   Removed unused JpegImagePlugin.\_fixup_dict function [#&#8203;4957](https://togithub.com/python-pillow/Pillow/issues/4957)
    [radarhere]

-   Added reading and writing of private PNG chunks [#&#8203;4292](https://togithub.com/python-pillow/Pillow/issues/4292)
    [radarhere]

-   Implement anchor for TrueType fonts [#&#8203;4930](https://togithub.com/python-pillow/Pillow/issues/4930)
    [nulano, hugovk]

-   Fixed bug in Exif **delitem** [#&#8203;4942](https://togithub.com/python-pillow/Pillow/issues/4942)
    [radarhere]

-   Fix crash in ImageTk.PhotoImage on MinGW 64-bit [#&#8203;4946](https://togithub.com/python-pillow/Pillow/issues/4946)
    [nulano]

-   Moved CVE images to pillow-depends [#&#8203;4929](https://togithub.com/python-pillow/Pillow/issues/4929)
    [radarhere]

-   Refactor font_getsize and font_render [#&#8203;4910](https://togithub.com/python-pillow/Pillow/issues/4910)
    [nulano]

-   Fixed loading profile with non-ASCII path on Windows [#&#8203;4914](https://togithub.com/python-pillow/Pillow/issues/4914)
    [radarhere]

-   Fixed effect_spread bug for zero distance [#&#8203;4908](https://togithub.com/python-pillow/Pillow/issues/4908)
    [radarhere, hugovk]

-   Added formats parameter to Image.open [#&#8203;4837](https://togithub.com/python-pillow/Pillow/issues/4837)
    [nulano, radarhere]

-   Added regular_polygon draw method [#&#8203;4846](https://togithub.com/python-pillow/Pillow/issues/4846)
    [comhar]

-   Raise proper TypeError in putpixel [#&#8203;4882](https://togithub.com/python-pillow/Pillow/issues/4882)
    [nulano, hugovk]

-   Added writing of subIFDs [#&#8203;4862](https://togithub.com/python-pillow/Pillow/issues/4862)
    [radarhere]

-   Fix IFDRational **eq** bug [#&#8203;4888](https://togithub.com/python-pillow/Pillow/issues/4888)
    [luphord, radarhere]

-   Fixed duplicate variable name [#&#8203;4885](https://togithub.com/python-pillow/Pillow/issues/4885)
    [liZe, radarhere]

-   Added homebrew zlib include directory [#&#8203;4842](https://togithub.com/python-pillow/Pillow/issues/4842)
    [radarhere]

-   Corrected inverted PDF CMYK colors [#&#8203;4866](https://togithub.com/python-pillow/Pillow/issues/4866)
    [radarhere]

-   Do not try to close file pointer if file pointer is empty [#&#8203;4823](https://togithub.com/python-pillow/Pillow/issues/4823)
    [radarhere]

-   ImageOps.autocontrast: add mask parameter [#&#8203;4843](https://togithub.com/python-pillow/Pillow/issues/4843)
    [navneeth, hugovk]

-   Read EXIF data tEXt chunk into info as bytes instead of string [#&#8203;4828](https://togithub.com/python-pillow/Pillow/issues/4828)
    [radarhere]

-   Replaced distutils with setuptools [#&#8203;4797](https://togithub.com/python-pillow/Pillow/issues/4797), [#&#8203;4809](https://togithub.com/python-pillow/Pillow/issues/4809), [#&#8203;4814](https://togithub.com/python-pillow/Pillow/issues/4814), [#&#8203;4817](https://togithub.com/python-pillow/Pillow/issues/4817), [#&#8203;4829](https://togithub.com/python-pillow/Pillow/issues/4829), [#&#8203;4890](https://togithub.com/python-pillow/Pillow/issues/4890)
    [hugovk, radarhere]

-   Add MIME type to PsdImagePlugin [#&#8203;4788](https://togithub.com/python-pillow/Pillow/issues/4788)
    [samamorgan]

-   Allow ImageOps.autocontrast to specify low and high cutoffs separately [#&#8203;4749](https://togithub.com/python-pillow/Pillow/issues/4749)
    [millionhz, radarhere]

</details>

---

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vision/snippets/crop_hints/requirements.txt

@@ -1,2 +1,2 @@
 google-cloud-vision==2.0.0
-pillow==7.2.0
+pillow==8.0.0

vision/snippets/document_text/requirements.txt

@@ -1,2 +1,2 @@
 google-cloud-vision==2.0.0
-pillow==7.2.0
+pillow==8.0.0

vision/snippets/face_detection/requirements.txt

@@ -1,2 +1,2 @@
 google-cloud-vision==2.0.0
-pillow==7.2.0
+pillow==8.0.0