Bump attrs from 21.2.0 to 21.3.0

Bumps [attrs](https://github.com/python-attrs/attrs) from 21.2.0 to 21.3.0.
- [Release notes](https://github.com/python-attrs/attrs/releases)
- [Changelog](https://github.com/python-attrs/attrs/blob/main/CHANGELOG.rst)
- [Commits](python-attrs/attrs@21.2.0...21.3.0)

---
updated-dependencies:
- dependency-name: attrs
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

docs_requirements.txt

@@ -1,7 +1,7 @@
 alabaster==0.7.12
 argon2-cffi==21.3.0
 async-generator==1.10
-attrs==21.2.0
+attrs==21.3.0
 Babel==2.9.1
 backcall==0.2.0
 bleach==4.1.0

requirements.txt

@@ -1,6 +1,6 @@
 argon2-cffi~=21.3.0
 async-generator~=1.10
-attrs~=21.2.0
+attrs~=21.3.0
 backcall~=0.2.0
 bleach~=4.1.0
 broadbean~=0.10.0

test_requirements.txt

@@ -1,6 +1,6 @@
 apipkg==2.1.0
 atomicwrites==1.4.0
-attrs==21.2.0
+attrs==21.3.0
 certifi==2021.10.8
 chardet==4.0.0
 colorama==0.4.4