Bump pytest-qt from 3.3.0 to 4.0.2

Bumps [pytest-qt](https://github.com/pytest-dev/pytest-qt) from 3.3.0 to 4.0.2.
- [Release notes](https://github.com/pytest-dev/pytest-qt/releases)
- [Changelog](https://github.com/pytest-dev/pytest-qt/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest-qt@3.3.0...4.0.2)

---
updated-dependencies:
- dependency-name: pytest-qt
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

test-requirements.txt

@@ -1,5 +1,5 @@
 pytest==6.2.1
-pytest-qt==3.3.0
+pytest-qt==4.0.2
 pytest-cov==2.10.1
 pytest-mock==3.5.1
 pytest-pylint==0.18.0