Update flake8 requirement in /tools in the python-packages group

Updates the requirements on [flake8](https://github.com/pycqa/flake8) to permit the latest version.

Updates `flake8` to 7.1.2
- [Commits](PyCQA/flake8@7.1.1...7.1.2)

---
updated-dependencies:
- dependency-name: flake8
  dependency-type: direct:production
  dependency-group: python-packages
...

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

tools/requirements.txt

@@ -4,5 +4,5 @@ requests~=2.32.3
 mypy~=1.15
 black~=25.1.0
 isort~=6.0.0
-flake8~=7.1.1
+flake8~=7.1.2
 types-requests~=2.32.0