Upgrade to flake8 v6 (#8007)

* Upgrade to flake8 v6

* updating DIRECTORY.md

Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>

machine_learning/sequential_minimum_optimization.py

@@ -314,7 +314,7 @@ class SmoSVM:
             l, h = max(0.0, a2 - a1), min(self._c, self._c + a2 - a1)
         else:
             l, h = max(0.0, a2 + a1 - self._c), min(self._c, a2 + a1)
-        if l == h:  # noqa: E741
+        if l == h:
             return None, None
 
         # calculate eta