Ruff: enable most of bugbear (#29320)

* added mutable default args

* most of the Bs

* add comment about lrucache
old-commit-hash: 62c1e6592439119f360dd64b854e7047f35222ba

scripts/code_stats.py

@@ -8,7 +8,7 @@ fouts = {x.decode('utf-8') for x in subprocess.check_output(['git', 'ls-files'])
 
 pyf = []
 for d in ["cereal", "common", "scripts", "selfdrive", "tools"]:
-  for root, dirs, files in os.walk(d):
+  for root, _, files in os.walk(d):
     for f in files:
       if f.endswith(".py"):
         pyf.append(os.path.join(root, f))