build(deps): bump holidays from 0.48 to 0.50 (#131)

Bumps [holidays](https://github.com/vacanza/python-holidays) from 0.48 to 0.50.
- [Release notes](https://github.com/vacanza/python-holidays/releases)
- [Changelog](https://github.com/vacanza/python-holidays/blob/dev/CHANGES)
- [Commits](vacanza/python-holidays@v0.48...v0.50)

---
updated-dependencies:
- dependency-name: holidays
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Marcel Johannesmann <mj0nez@fn.de>

requirements.txt

@@ -4,7 +4,7 @@
 #
 #    pip-compile requirements.in
 #
-holidays==0.48
+holidays==0.50
     # via -r requirements.in
 python-dateutil==2.9.0.post0
     # via