Update pytest-cov requirement from <=5.0.0 to <=6.0.0

Updates the requirements on [pytest-cov](https://github.com/pytest-dev/pytest-cov) to permit the latest version.
- [Changelog](https://github.com/pytest-dev/pytest-cov/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest-cov@v1.0...v6.0.0)

---
updated-dependencies:
- dependency-name: pytest-cov
  dependency-type: direct:production
...

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

pyproject.toml

@@ -76,7 +76,7 @@ dependencies = [
 test = [
     "tox<=4.23.2",
     "coverage<=7.6.7",
-    "pytest-cov<=5.0.0",
+    "pytest-cov<=6.0.0",
 ]
 format = [
     "ruff==0.7.4",      # Linting/formatting