build(deps): bump pytest-flakes in /testing/plugins_integration (#8087)

Bumps [pytest-flakes](https://github.com/asmeurer/pytest-flakes) from 4.0.2 to 4.0.3.
- [Release notes](https://github.com/asmeurer/pytest-flakes/releases)
- [Commits](https://github.com/asmeurer/pytest-flakes/commits)

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

testing/plugins_integration/requirements.txt

@@ -4,7 +4,7 @@ pytest-asyncio==0.14.0
 pytest-bdd==4.0.1
 pytest-cov==2.10.1
 pytest-django==4.1.0
-pytest-flakes==4.0.2
+pytest-flakes==4.0.3
 pytest-html==3.0.0
 pytest-mock==3.3.1
 pytest-rerunfailures==9.1.1