chore(deps-dev): bump setuptools from 50.3.0 to 50.3.1

Bumps [setuptools](https://github.com/pypa/setuptools) from 50.3.0 to 50.3.1.
- [Release notes](https://github.com/pypa/setuptools/releases)
- [Changelog](https://github.com/pypa/setuptools/blob/master/CHANGES.rst)
- [Commits](pypa/setuptools@v50.3.0...v50.3.1)

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

dev-requirements.txt

@@ -14,4 +14,4 @@ twine==1.13.0;python_version<'3.0'
 twine==3.2.0;python_version>='3.6'
 wheel==0.35.1
 setuptools==44.1.0;python_version<'3.0'
-setuptools==50.3.0;python_version>='3.6'
+setuptools==50.3.1;python_version>='3.6'