build(deps): bump kohlrahbi from 1.11.2 to 1.12.1

Bumps [kohlrahbi](https://github.com/Hochfrequenz/kohlrahbi) from 1.11.2 to 1.12.1.
- [Release notes](https://github.com/Hochfrequenz/kohlrahbi/releases)
- [Commits](Hochfrequenz/kohlrahbi@v1.11.2...v1.12.1)

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

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

requirements.txt

@@ -18,7 +18,7 @@ efoli==1.3.0
     #   kohlrahbi
 et-xmlfile==2.0.0
     # via openpyxl
-kohlrahbi==1.11.2
+kohlrahbi==1.12.1
     # via ahlbatross (pyproject.toml)
 lxml==5.3.0
     # via python-docx