build(deps-dev): update pytest-cov requirement (#97)

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:development
...

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

Author: dependabot[bot]

pyproject.toml

@@ -42,7 +42,7 @@ isort = "^5.12.0"
 pre-commit = ">=3.3.3,<5.0.0"
 pysen = ">=0.10.5,<0.12.0"
 pytest = ">=7.4,<9.0"
-pytest-cov = ">=4.1,<6.0"
+pytest-cov = ">=4.1,<7.0"
 pytest-xdist = "^3.3.1"
 
 [build-system]