build(deps-dev): bump time-machine from 2.7.1 to 2.8.0 (#531)

Bumps [time-machine](https://github.com/adamchainz/time-machine) from 2.7.1 to 2.8.0.
- [Release notes](https://github.com/adamchainz/time-machine/releases)
- [Changelog](https://github.com/adamchainz/time-machine/blob/main/HISTORY.rst)
- [Commits](adamchainz/time-machine@2.7.1...2.8.0)

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

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Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

pyproject.toml

@@ -70,7 +70,7 @@ exclude = [
   pytest-resource-path = "^1.3.0"
   pytest-mockservers = "^0.6.0"
   pytest-sugar = "^0.9.5"
-  time-machine = "^2.7.1"
+  time-machine = "^2.8.0"
   types-toml = "^0.10.8"
   yamllint = "^1.27.1"