build(deps): bump pytest-cov from 2.5.1 to 2.11.0 (#870)

Bumps [pytest-cov](https://github.com/pytest-dev/pytest-cov) from 2.5.1 to 2.11.0.
- [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@v2.5.1...v2.11.0)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

frontend/requirements.txt

@@ -16,7 +16,7 @@ pytest==6.2.1
 # Pytest plugin for measuring coverage.
 # License: MIT
 # Upstream url: https://github.com/pytest-dev/pytest-cov
-pytest-cov==2.5.1
+pytest-cov==2.11.0
 
 # Rolling backport of unittest.mock for all Pythons
 # License: BSD