Bump coverage[toml] from 7.6.7 to 7.6.8

Bumps [coverage[toml]](https://github.com/nedbat/coveragepy) from 7.6.7 to 7.6.8.
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](nedbat/coveragepy@7.6.7...7.6.8)

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

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

pyproject.toml

@@ -132,7 +132,7 @@ lint = [
 ]
 
 test-core = [
-    "coverage[toml]==7.6.7",
+    "coverage[toml]==7.6.8",
     "pytest==8.3.3",
     "pytest-asyncio==0.24.0",
     "dirty-equals==0.8.0",