Bump boto3 from 1.28.26 to 1.28.31 in /tests (#372)

Bumps [boto3](https://github.com/boto/boto3) from 1.28.26 to 1.28.31.
- [Release notes](https://github.com/boto/boto3/releases)
- [Changelog](https://github.com/boto/boto3/blob/develop/CHANGELOG.rst)
- [Commits](boto/boto3@1.28.26...1.28.31)

---
updated-dependencies:
- dependency-name: boto3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

tests/requirements.txt

@@ -1,3 +1,3 @@
-boto3==1.28.26
+boto3==1.28.31
 pytest==7.4.0
 requests==2.31.0