Bump pytest-cov from 2.12.1 to 5.0.0

Bumps [pytest-cov](https://github.com/pytest-dev/pytest-cov) from 2.12.1 to 5.0.0.
- [Changelog](https://github.com/pytest-dev/pytest-cov/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest-cov@v2.12.1...v5.0.0)

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

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

setup.cfg

@@ -107,7 +107,7 @@ dev =
     pydocstyle          == 6.1.1   # Do your docstrings look like everyone else's?
     coverage            == 5.5     # Does all your code get exercised?
     pytest              == 6.2.5   # Testing
-    pytest-cov          == 2.12.1  # pytest + coverage = pytest-cov
+    pytest-cov          == 5.0.0  # pytest + coverage = pytest-cov
     pytest-watch        == 4.2.0   # Automatic testing every time you save a file
     pytest-xdist        == 2.4.0   # You got multiple cores, right?
     pre-commit          == 2.15.0  # Auto-run checks on every commit