Update pytest-cov requirement from ~4.1 to ~5.0 (#124)

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...v5.0.0)

---
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

@@ -31,7 +31,7 @@ pymitter = ">=0.4,<0.6"
 [tool.poetry.dev-dependencies]
 pytest = "~8.1"
 pytest-asyncio = "~0.23"
-pytest-cov = "~4.1"
+pytest-cov = "~5.0"
 pytest-unordered = "~0.6"
 pre-commit = "~3.6"
 Sphinx = "~7.2"