Bump the minor group with 2 updates

Bumps the minor group with 2 updates: [black](https://github.com/psf/black) and [time-machine](https://github.com/adamchainz/time-machine).


Updates `black` from 25.11.0 to 25.12.0
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/main/CHANGES.md)
- [Commits](psf/black@25.11.0...25.12.0)

Updates `time-machine` from 3.1.0 to 3.2.0
- [Changelog](https://github.com/adamchainz/time-machine/blob/main/docs/changelog.rst)
- [Commits](adamchainz/time-machine@3.1.0...3.2.0)

---
updated-dependencies:
- dependency-name: black
  dependency-version: 25.12.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: minor
- dependency-name: time-machine
  dependency-version: 3.2.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: minor
...

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

Author: dependabot[bot]

pyproject.toml

@@ -68,9 +68,9 @@ dev-flake8 = [
   "pydoclint == 0.8.3",
   "pydocstyle == 6.3.0",
 ]
-dev-formatting = ["black == 25.11.0", "isort == 7.0.0"]
+dev-formatting = ["black == 25.12.0", "isort == 7.0.0"]
 dev-mkdocs = [
-  "black == 25.11.0",
+  "black == 25.12.0",
   "Markdown == 3.10",
   "mike == 2.1.3",
   "mkdocs-gen-files == 0.5.0",
@@ -103,7 +103,7 @@ dev-pytest = [
   "pytest-mock == 3.15.1",
   "pytest-asyncio == 1.3.0",
   "async-solipsism == 0.8",
-  "time-machine == 3.1.0",
+  "time-machine == 3.2.0",
   "hypothesis == 6.148.7",
   "frequenz-client-dispatch[cli]",
 ]