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] <support@github.com>

Author: dependabot[bot]

pyproject.toml

@@ -95,7 +95,7 @@ dependencies = [
 # Extras used by developers *of* briefcase are pinned to specific versions to
 # ensure environment consistency.
 dev = [
-    "coverage[toml] == 7.6.7",
+    "coverage[toml] == 7.6.8",
     "coverage-conditional-plugin == 0.9.0",
     "pre-commit == 4.0.1",
     "pytest == 8.3.3",