build(deps): Bump pytest-html in /testing/plugins_integration (#11384)

Bumps [pytest-html](https://github.com/pytest-dev/pytest-html) from 3.2.0 to 4.0.0.
- [Release notes](https://github.com/pytest-dev/pytest-html/releases)
- [Changelog](https://github.com/pytest-dev/pytest-html/blob/master/docs/changelog.rst)
- [Commits](https://github.com/pytest-dev/pytest-html/compare/v3.2.0...4.0.0)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

testing/plugins_integration/requirements.txt

@@ -5,7 +5,7 @@ pytest-bdd==6.1.1
 pytest-cov==4.1.0
 pytest-django==4.5.2
 pytest-flakes==4.0.5
-pytest-html==3.2.0
+pytest-html==4.0.0
 pytest-mock==3.11.1
 pytest-rerunfailures==12.0
 pytest-sugar==0.9.7