Bump vulture from 2.1 to 2.3

Bumps [vulture](https://github.com/jendrikseipp/vulture) from 2.1 to 2.3.
- [Release notes](https://github.com/jendrikseipp/vulture/releases)
- [Changelog](https://github.com/jendrikseipp/vulture/blob/master/CHANGELOG.md)
- [Commits](jendrikseipp/vulture@v2.1...v2.3)

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

Author: dependabot-preview[bot]

dev-requirements.txt

@@ -28,4 +28,4 @@ pytest==6.2.1  # Test runners
 sphinx-autodoc-typehints==1.11.1
 sphinxcontrib-spelling==7.1.0
 twine==3.3.0
-vulture==2.1
+vulture==2.3