Update pytest-cov requirement from <5,>=4 to >=4,<6 (#1423)

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

setup.py

@@ -82,7 +82,7 @@
     'pre-commit>=3.4.0,<4',
     'pytest>=7.2.1,<8',
     'pytest_codeblocks>=0.16.1,<0.17',
-    'pytest-cov>=4,<5',
+    'pytest-cov>=4,<6',
     'pyright==1.1.256',
     'toml>=0.10.2,<0.11',
     'packaging>=21,<23',