Bump boto3 from 1.16.39 to 1.16.40

Bumps [boto3](https://github.com/boto/boto3) from 1.16.39 to 1.16.40.
- [Release notes](https://github.com/boto/boto3/releases)
- [Changelog](https://github.com/boto/boto3/blob/develop/CHANGELOG.rst)
- [Commits](boto/boto3@1.16.39...1.16.40)

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

requirements-test.txt

@@ -2,7 +2,7 @@
 pytest-cov==2.10.1
 pytest-xdist==2.2.0
 coverage==5.3 # pytest-cov
-boto3==1.16.39
+boto3==1.16.40
 mirakuru==2.3.0
 port-for==0.4
 pytest==6.2.1