build(deps): bump frozendict from 2.3.8 to 2.3.9

Bumps [frozendict](https://github.com/Marco-Sulla/python-frozendict) from 2.3.8 to 2.3.9.
- [Release notes](https://github.com/Marco-Sulla/python-frozendict/releases)
- [Commits](https://github.com/Marco-Sulla/python-frozendict/compare/v2.3.8...v2.3.9)

---
updated-dependencies:
- dependency-name: frozendict
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

pyproject.toml

@@ -61,7 +61,7 @@ dashvis = "^0.1.3"
 datetime = "^5.3"
 deutschland = {git = "https://github.com/TrisNol/deutschland.git", branch = "hotfix/python-3.11-support"}
 flask-compress = "^1.14"
-frozendict = "^2.3.8"
+frozendict = "^2.3.9"
 html5lib = "^1.1"
 loguru = "^0.7.0"
 matplotlib = "^3.8.2"