Update pytest-cov requirement from <5.1,>=4.1 to >=4.1,<6.1 (#900)

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@v4.1.0...v6.0.0)

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

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

Author: dependabot[bot]

pyproject.toml

@@ -67,7 +67,7 @@ test = [
     "Pyjwt~=2.9.0",
     "pytest>=8.2,<9",
     "pytest-asyncio~=0.23",
-    "pytest-cov>=4.1,<5.1",
+    "pytest-cov>=4.1,<6.1",
     "pytest-mock>=3.12,<3.15",
     "pytest-randomly==3.*",
     "pytest-xdist==3.*",