build(deps-dev): update pytest-cov requirement from <4.2 to <5.1

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...v5.0.0)

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

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

setup.py

@@ -44,7 +44,7 @@
         "test": [
             "pytest<9",
             "pytest-cache<2",
-            "pytest-cov<4.2",
+            "pytest-cov<5.1",
             "python-dotenv<1.1",
             "responses<0.26",
         ],