Bump towncrier from 22.8.0 to 22.12.0 (#800)

Bumps [towncrier](https://github.com/twisted/towncrier) from 22.8.0 to 22.12.0.
- [Release notes](https://github.com/twisted/towncrier/releases)
- [Changelog](https://github.com/twisted/towncrier/blob/trunk/NEWS.rst)
- [Commits](twisted/towncrier@22.8.0...22.12.0)

---
updated-dependencies:
- dependency-name: towncrier
  dependency-type: direct:production
  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>

requirements/towncrier.txt

@@ -1 +1 @@
-towncrier==22.8.0
+towncrier==22.12.0