Bump setuptools from 51.0.0 to 51.1.0.post20201221 (#322)

Bumps [setuptools](https://github.com/pypa/setuptools) from 51.0.0 to 51.1.0.post20201221.
- [Release notes](https://github.com/pypa/setuptools/releases)
- [Changelog](https://github.com/pypa/setuptools/blob/main/CHANGES.rst)
- [Commits](https://github.com/pypa/setuptools/commits)

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

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

requirements-dev.txt

@@ -1,4 +1,4 @@
-setuptools==51.0.0
+setuptools==51.1.0.post20201221
 wheel==0.36.2
 twine==3.2.0
 unittest-xml-reporting==3.0.4