chore(deps-dev): update coverage requirement from ~=7.8 to ~=7.9

Updates the requirements on [coverage](https://github.com/nedbat/coveragepy) to permit the latest version.
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](nedbat/coveragepy@7.8.0...7.9.0)

---
updated-dependencies:
- dependency-name: coverage
  dependency-version: 7.9.0
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements/dev.txt

@@ -4,7 +4,7 @@ pytest~=8.3.5
 pytest-asyncio~=0.24.0
 # pytest-order~=1.0.1
 mypy~=1.15.0
-coverage~=7.8
+coverage~=7.9
 pre-commit==4.2.0
 codespell==2.4.1
 bandit==1.8.3