Bump coverage[toml] from 7.6.4 to 7.6.9

Bumps [coverage[toml]](https://github.com/nedbat/coveragepy) from 7.6.4 to 7.6.9.
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](nedbat/coveragepy@7.6.4...7.6.9)

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

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

setup.py

@@ -79,7 +79,7 @@
 extra_deps = {}
 
 extra_deps['dev'] = [
-    'coverage[toml]==7.6.4',
+    'coverage[toml]==7.6.9',
     'pre-commit>=3.4.0,<4',
     'pytest>=7.2.1,<9',
     'pytest_codeblocks>=0.16.1,<0.18',