build(deps): bump pytest-html in /testing/plugins_integration
build(deps): bump pytest-html in /testing/plugins_integration

Bumps [pytest-html](https://github.com/pytest-dev/pytest-html) from 3.1.0 to 3.1.1.
- [Release notes](https://github.com/pytest-dev/pytest-html/releases)
- [Changelog](https://github.com/pytest-dev/pytest-html/blob/master/CHANGES.rst)
- [Commits](https://github.com/pytest-dev/pytest-html/compare/v3.1.0...v3.1.1)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
pytest-dev/pytest,nicoddemus/pytest,RonnyPfannschmidt/pytest,markshao/pytest,nicoddemus/pytest,Akasurde/pytest