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:development
...

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

pyproject.toml

@@ -37,7 +37,7 @@ jsonschema = "4.16.0"
 
 [tool.poetry.group.dev.dependencies]
 pytest = "7.1.2"
-pytest-cov = "3.0.0"
+pytest-cov = "4.0.0"
 pytest-runner = "^6.0.0"
 nbval = "^0.10.0"
 requests-mock = "^1.10.0"