Bump time-machine from 2.16.0 to 2.19.0 in the minor group

Bumps the minor group with 1 update: [time-machine](https://github.com/adamchainz/time-machine).


Updates `time-machine` from 2.16.0 to 2.19.0
- [Changelog](https://github.com/adamchainz/time-machine/blob/main/docs/changelog.rst)
- [Commits](adamchainz/time-machine@2.16.0...2.19.0)

---
updated-dependencies:
- dependency-name: time-machine
  dependency-version: 2.19.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: minor
...

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

Author: dependabot[bot]

pyproject.toml

@@ -94,7 +94,7 @@ dev-pytest = [
   "pytest-mock == 3.14.1",
   "pytest-asyncio == 1.1.0",
   "async-solipsism == 0.8",
-  "time-machine == 2.16.0",
+  "time-machine == 2.19.0",
 ]
 dev = [
   "frequenz-dispatch[dev-mkdocs,dev-flake8,dev-formatting,dev-mkdocs,dev-mypy,dev-noxfile,dev-pylint,dev-pytest]",