Bump coverage[toml] from 7.6.9 to 7.6.12

Bumps [coverage[toml]](https://github.com/nedbat/coveragepy) from 7.6.9 to 7.6.12.
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](coveragepy/coveragepy@7.6.9...7.6.12)

---
updated-dependencies:
- dependency-name: coverage[toml]
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

requirements-dev.txt

@@ -1,4 +1,4 @@
-coverage[toml]==7.6.9
+coverage[toml]==7.6.12
 ruff==0.8.3
 sphinx==8.1.3
 webtest==3.0.2