⬆️ Update pytest-cov requirement from <5,>=4 to >=4,<7 (#11)

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...v6.0.0)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: TAHRI Ahmed R. <[email protected]>

Author: dependabot[bot]

dev-requirements.txt

@@ -1,4 +1,4 @@
 pytest>=7,<9
-pytest-cov>=4,<5
+pytest-cov>=4,<7
 pytest-xdist>=3,<4
 hypothesis>=5.5,<7