Bump boto3 from 1.17.88 to 1.17.93

Bumps [boto3](https://github.com/boto/boto3) from 1.17.88 to 1.17.93.
- [Release notes](https://github.com/boto/boto3/releases)
- [Changelog](https://github.com/boto/boto3/blob/develop/CHANGELOG.rst)
- [Commits](boto/boto3@1.17.88...1.17.93)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

requirements-ci.txt

@@ -3,4 +3,4 @@ pytest-cov==2.12.1
 coverage==5.5
 coveralls==3.1.0
 moto==2.0.8
-boto3==1.17.88
+boto3==1.17.93