Bump pycodestyle from 2.7.0 to 2.8.0 in /tools

Bumps [pycodestyle](https://github.com/PyCQA/pycodestyle) from 2.7.0 to 2.8.0.
- [Release notes](https://github.com/PyCQA/pycodestyle/releases)
- [Changelog](https://github.com/PyCQA/pycodestyle/blob/main/CHANGES.txt)
- [Commits](PyCQA/pycodestyle@2.7.0...2.8.0)

---
updated-dependencies:
- dependency-name: pycodestyle
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

tools/requirements_flake8.txt

@@ -1,4 +1,4 @@
 flake8==3.9.2
-pycodestyle==2.7.0
+pycodestyle==2.8.0
 pyflakes==2.4.0
 pep8-naming==0.11.1