Bump pep8-naming in /{{cookiecutter.app_name}}/requirements

Bumps [pep8-naming](https://github.com/PyCQA/pep8-naming) from 0.8.2 to 0.9.0.
- [Release notes](https://github.com/PyCQA/pep8-naming/releases)
- [Changelog](https://github.com/PyCQA/pep8-naming/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/PyCQA/pep8-naming/compare/0.8.2...0.9.0)

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

{{cookiecutter.app_name}}/requirements/dev.txt

@@ -15,4 +15,4 @@ flake8-debugger==3.2.1
 flake8-docstrings==1.5.0
 flake8-isort==2.7.0
 isort==4.3.21
-pep8-naming==0.8.2
+pep8-naming==0.9.0