Bump requests from 2.26.0 to 2.31.0 (#215)

Bumps [requests](https://github.com/psf/requests) from 2.26.0 to 2.31.0.
- [Release notes](https://github.com/psf/requests/releases)
- [Changelog](https://github.com/psf/requests/blob/main/HISTORY.md)
- [Commits](psf/requests@v2.26.0...v2.31.0)

---
updated-dependencies:
- dependency-name: requests
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements-frozen.txt

@@ -21,7 +21,7 @@ polib==1.1.0
 pylint==2.4.4
 pyparsing==2.4.6
 pytz==2019.3
-requests==2.26.0
+requests==2.31.0
 six==1.14.0
 sorl-thumbnail==12.6.3
 sqlparse==0.4.4