Bump pytest-cov from 3.0.0 to 4.0.0 (#1151)

Bumps [pytest-cov](https://github.com/pytest-dev/pytest-cov) from 3.0.0 to 4.0.0.
- [Release notes](https://github.com/pytest-dev/pytest-cov/releases)
- [Changelog](https://github.com/pytest-dev/pytest-cov/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest-cov@v3.0.0...v4.0.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

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

Author: dependabot[bot]

requirements_dev_optional.txt

@@ -15,7 +15,7 @@ pymongo==4.2.0
 tox==3.26.0
 coverage
 flake8==5.0.4
-pytest-cov==3.0.0
+pytest-cov==4.0.0
 pytest-doctestplus==0.12.1
 pytest-timeout==2.1.0
 h5py==3.7.0