Update pytest-cov requirement from <5.0,>=4.0.0 to >=4.0.0,<6.0

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@v4.0.0...v5.0.0)

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

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

setup.py

@@ -66,7 +66,7 @@
             'flake8-rst-docstrings >=0.3.0, < 0.4.0',
             'openfisca-country-template >=7.1.5, <8.0.0',
             'pytest >=8.3.3, < 9.0',
-            'pytest-cov >=4.0.0, < 5.0',
+            'pytest-cov >= 4.0.0, < 6.0',
             'scipy >=1.10.1, < 2.0',
             'pytest-order >=1.1.0, <2.0',
             ],