Update pytest-cov requirement from <5,>=2 to >=2,<6

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@v2.0.0...v5.0.0)

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

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

setup.py

@@ -90,7 +90,7 @@
         ],
         "test": [
             "pytest>=6,<9",
-            "pytest-cov>=2,<5",
+            "pytest-cov>=2,<6",
             "re-assert>=1,<2",
         ],
     },