Bump pytest-mock from 3.5.1 to 3.6.0 in /testing/plugins_integration

Bumps [pytest-mock](https://github.com/pytest-dev/pytest-mock) from 3.5.1 to 3.6.0.
- [Release notes](https://github.com/pytest-dev/pytest-mock/releases)
- [Changelog](https://github.com/pytest-dev/pytest-mock/blob/main/CHANGELOG.rst)
- [Commits](https://github.com/pytest-dev/pytest-mock/compare/v3.5.1...v3.6.0)

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

testing/plugins_integration/requirements.txt

@@ -6,7 +6,7 @@ pytest-cov==2.11.1
 pytest-django==4.2.0
 pytest-flakes==4.0.3
 pytest-html==3.1.1
-pytest-mock==3.5.1
+pytest-mock==3.6.0
 pytest-rerunfailures==9.1.1
 pytest-sugar==0.9.4
 pytest-trio==0.7.0