Bump boto3 from 1.26.5 to 1.28.0 in /tdrs-backend

Bumps [boto3](https://github.com/boto/boto3) from 1.26.5 to 1.28.0.
- [Release notes](https://github.com/boto/boto3/releases)
- [Changelog](https://github.com/boto/boto3/blob/develop/CHANGELOG.rst)
- [Commits](boto/boto3@1.26.5...1.28.0)

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

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

tdrs-backend/Pipfile

@@ -21,7 +21,7 @@ pytest-factoryboy = "*"
 
 [packages]
 pytz = "2022.1"
-boto3 = "==1.26.5"
+boto3 = "==1.28.0"
 cryptography = "==3.4.7"
 dj-database-url = "==0.5.0"
 django = "==3.2.15"