chore(deps): update dependency google-cloud-bigquery-datatransfer to v3.2.0 (#168)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [google-cloud-bigquery-datatransfer](https://togithub.com/googleapis/python-bigquery-datatransfer) | `==3.1.1` -> `==3.2.0` | [![age](https://badges.renovateapi.com/packages/pypi/google-cloud-bigquery-datatransfer/3.2.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-cloud-bigquery-datatransfer/3.2.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-cloud-bigquery-datatransfer/3.2.0/compatibility-slim/3.1.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-cloud-bigquery-datatransfer/3.2.0/confidence-slim/3.1.1)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>googleapis/python-bigquery-datatransfer</summary>

### [`v3.2.0`](https://togithub.com/googleapis/python-bigquery-datatransfer/blob/master/CHANGELOG.md#&#8203;320-httpswwwgithubcomgoogleapispython-bigquery-datatransfercomparev311v320-2021-06-22)

[Compare Source](https://togithub.com/googleapis/python-bigquery-datatransfer/compare/v3.1.1...v3.2.0)

##### Features

-   support self-signed JWT flow for service accounts ([046c368](https://www.github.com/googleapis/python-bigquery-datatransfer/commit/046c368cf5a75a210b0ecc7e6e1eee9bcd907669))

##### Bug Fixes

-   add async client to %name\_%version/init.py ([046c368](https://www.github.com/googleapis/python-bigquery-datatransfer/commit/046c368cf5a75a210b0ecc7e6e1eee9bcd907669))

##### Documentation

-   omit mention of Python 2.7 in 'CONTRIBUTING.rst' ([#&#8203;1127](https://www.github.com/googleapis/python-bigquery-datatransfer/issues/1127)) ([#&#8203;164](https://www.github.com/googleapis/python-bigquery-datatransfer/issues/164)) ([2741e4f](https://www.github.com/googleapis/python-bigquery-datatransfer/commit/2741e4fb1d9074494872fafcec96d870b14b671d)), closes [#&#8203;1126](https://www.github.com/googleapis/python-bigquery-datatransfer/issues/1126)

##### [3.1.1](https://www.github.com/googleapis/python-bigquery-datatransfer/compare/v3.1.0...v3.1.1) (2021-04-07)

##### Bug Fixes

-   require proto-plus>=1.15.0 ([91910f1](https://www.github.com/googleapis/python-bigquery-datatransfer/commit/91910f1ea01c5324fa63a7d85a034d08aeaae3f9))
-   use correct retry deadline ([#&#8203;121](https://www.github.com/googleapis/python-bigquery-datatransfer/issues/121)) ([91910f1](https://www.github.com/googleapis/python-bigquery-datatransfer/commit/91910f1ea01c5324fa63a7d85a034d08aeaae3f9))

</details>

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bigquery-datatransfer/snippets/requirements.txt

@@ -1 +1 @@
-google-cloud-bigquery-datatransfer==3.1.1
+google-cloud-bigquery-datatransfer==3.2.0