Bug 1834888 [wpt PR 40208] - Bump pytest-cov from 4.0.0 to 4.1.0 in /tools, a=testonly

Automatic update from web-platform-tests
Bump pytest-cov from 4.0.0 to 4.1.0 in /tools

Bumps [pytest-cov](https://github.com/pytest-dev/pytest-cov) from 4.0.0 to 4.1.0.
- [Changelog](https://github.com/pytest-dev/pytest-cov/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest-cov@v4.0.0...v4.1.0)

---
updated-dependencies:
- dependency-name: pytest-cov
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <supportgithub.com>
--

wpt-commits: 465ea96b617358450f737fd40479869f58982e12
wpt-pr: 40208

UltraBlame original commit: 1d2cea3bbefb5bbc4c4c1dc0b52be26bacc74b26

Author: marco-c

testing/web-platform/tests/tools/requirements_pytest.txt

@@ -13,7 +13,7 @@ cov
 =
 4
 .
-0
+1
 .
 0
 hypothesis