Update coverage[toml] requirement from ~=7.8.0 to ~=7.9.1

Updates the requirements on [coverage[toml]](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](coveragepy/coveragepy@7.8.0...7.9.1)

---
updated-dependencies:
- dependency-name: coverage[toml]
  dependency-version: 7.9.1
  dependency-type: direct:production
...

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

Author: dependabot[bot]

pyproject.toml

@@ -107,7 +107,7 @@ dependencies = [
 [project.optional-dependencies]
 test = [
     "click-extra [pytest] ~= 5.0.2",
-    "coverage [toml] ~= 7.8.0",
+    "coverage [toml] ~= 7.9.1",
     "pytest ~= 8.4.0",
     "pyyaml ~= 6.0.0",
     # More pytest plugins at: https://docs.pytest.org/en/latest/reference/plugin_list.html