DEP(deps): Update boto3 requirement from ~=1.20.38 to ~=1.20.39

Updates the requirements on [boto3](https://github.com/boto/boto3) to permit the latest version.
- [Release notes](https://github.com/boto/boto3/releases)
- [Changelog](https://github.com/boto/boto3/blob/develop/CHANGELOG.rst)
- [Commits](boto/boto3@1.20.38...1.20.39)

---
updated-dependencies:
- dependency-name: boto3
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements.txt

@@ -1,7 +1,7 @@
 pytest
 requests~=2.27.1
 six>=1.15,<2
-boto3~=1.20.38
+boto3~=1.20.39
 cachetools~=5.0.0
 setuptools~=60.5.0
 pytz~=2021.3