Bump pytest-cov from 2.12.0 to 5.0.0

Bumps [pytest-cov](https://github.com/pytest-dev/pytest-cov) from 2.12.0 to 5.0.0.
- [Changelog](https://github.com/pytest-dev/pytest-cov/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest-cov@v2.12.0...v5.0.0)

---
updated-dependencies:
- dependency-name: pytest-cov
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements.txt

@@ -2,6 +2,6 @@
 mypy==1.0.0
 pre-commit==2.13.0
 pytest==6.2.4
-pytest-cov==2.12.0
+pytest-cov==5.0.0
 types-backports
 types-setuptools