Bump time-machine from 2.19.0 to 3.1.0

Bumps [time-machine](https://github.com/adamchainz/time-machine) from 2.19.0 to 3.1.0.
- [Changelog](https://github.com/adamchainz/time-machine/blob/main/docs/changelog.rst)
- [Commits](adamchainz/time-machine@2.19.0...3.1.0)

---
updated-dependencies:
- dependency-name: time-machine
  dependency-version: 3.1.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

pyproject.toml

@@ -103,7 +103,7 @@ dev-pytest = [
   "pytest-mock == 3.15.1",
   "pytest-asyncio == 1.2.0",
   "async-solipsism == 0.8",
-  "time-machine == 2.19.0",
+  "time-machine == 3.1.0",
   "hypothesis == 6.142.5",
   "frequenz-client-dispatch[cli]",
 ]