Update pytest-cov requirement from ~=3.0.0 to ~=4.0.0

Updates the requirements on [pytest-cov](https://github.com/pytest-dev/pytest-cov) to permit the latest version.
- [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:production
...

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

Author: dependabot[bot]

requirements_test.txt

@@ -54,8 +54,8 @@ jax[cpu]==0.3.17
 pytest~=7.1.3
 pytest-flake8~=1.1.1
 flake8~=4.0.1
-pytest-mock~=3.8.2
-pytest-cov~=3.0.0
+pytest-mock~=3.9.0
+pytest-cov~=4.0.0
 codecov~=2.1.12
 requests~=2.28.1