Update requests requirement from ==2.25.* to ==2.28.* (#107)

Updates the requirements on [requests](https://github.com/psf/requests) to permit the latest version.
- [Release notes](https://github.com/psf/requests/releases)
- [Changelog](https://github.com/psf/requests/blob/main/HISTORY.md)
- [Commits](psf/requests@v2.25.0...v2.28.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

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

requirements-test.txt

@@ -9,6 +9,6 @@ pytest==6.2.*
 pytest-cov==3.0.*
 pytest-vcr==1.0.*
 pytest-asyncio==0.15.*
-requests==2.25.*
+requests==2.28.*
 boto3==1.20.24
 botocore==1.23.24