Update towncrier requirement from ~=22.8 to ~=22.12 (#7986)

Updates the requirements on [towncrier](https://github.com/twisted/towncrier) to permit the latest version.
- [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
...

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doc/requirements.txt

@@ -1,6 +1,6 @@
 Sphinx==5.3.0
 sphinx-reredirects<1
 myst-parser~=0.18
-towncrier~=22.8
+towncrier~=22.12
 furo==2022.12.7
 -e .

requirements_test_min.txt

@@ -6,5 +6,5 @@ py~=1.11.0
 pytest~=7.2
 pytest-benchmark~=4.0
 pytest-timeout~=2.1
-towncrier~=22.8
+towncrier~=22.12
 requests