build(deps): bump holidays from 0.55 to 0.56

Bumps [holidays](https://github.com/vacanza/python-holidays) from 0.55 to 0.56.
- [Release notes](https://github.com/vacanza/python-holidays/releases)
- [Changelog](https://github.com/vacanza/python-holidays/blob/dev/CHANGES)
- [Commits](vacanza/holidays@v0.55...v0.56)

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

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -4,7 +4,7 @@
 #
 #    pip-compile requirements.in
 #
-holidays==0.55
+holidays==0.56
     # via -r requirements.in
 python-dateutil==2.9.0.post0
     # via