Bump pytest-cov from 2.10.1 to 2.11.0

Bumps [pytest-cov](https://github.com/pytest-dev/pytest-cov) from 2.10.1 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@v2.10.1...v2.11.0)

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

requirements-test.txt

@@ -3,7 +3,7 @@ pip>=9  # minimum installation requirements
 setuptools>=21  # minimum installation requirements
 coverage==5.3.1 # pytest-cov
 pytest==6.2.1
-pytest-cov==2.10.1
+pytest-cov==2.11.0
 pytest-xdist==2.2.0
 psycopg2-binary==2.8.6; platform_python_implementation != "PyPy"
 psycopg2cffi==2.8.1; platform_python_implementation == "PyPy"