Bump towncrier from 24.8.0 to 25.8.0 (#538)

Bumps [towncrier](https://github.com/twisted/towncrier) from 24.8.0 to 25.8.0.
- [Release notes](https://github.com/twisted/towncrier/releases)
- [Changelog](https://github.com/twisted/towncrier/blob/trunk/NEWS.rst)
- [Commits](twisted/towncrier@24.8.0...25.8.0)

---
updated-dependencies:
- dependency-name: towncrier
  dependency-version: 25.8.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

requirements/lint.txt

@@ -4,4 +4,4 @@ pre-commit==4.3.0
 sphinx==8.2.3
 sphinxcontrib-asyncio==0.3.0
 sphinxcontrib-spelling==8.0.1
-towncrier==24.8.0
+towncrier==25.8.0