build(deps-dev): update pytest-cov requirement (#337)

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
...

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

pyproject.toml

@@ -49,7 +49,7 @@ ruff = "0.7.1"
 [tool.poetry.group.tests.dependencies]
 coverage = { extras = ["toml"], version = "^7.3.2" }
 pytest = "^8.0.1"
-pytest-cov = ">=4.1,<6.0"
+pytest-cov = ">=4.1,<7.0"
 xdoctest = "^1.1.3"
 
 [tool.coverage.paths]