Disable the loop-iterator-mutation rule in ruff

This allows ruff check --preview to succeed again.

Author: correctmost

pyproject.toml

@@ -216,6 +216,7 @@ ignore = [
     "B008",     # function-call-in-default-argument
     "B904",     # raise-without-from-inside-except
     "B905",     # zip-without-explicit-strict
+    "B909",     # loop-iterator-mutation
     "COM812",   # missing-trailing-comma
     "PLC0415",  # import-outside-top-level
     "PLC1901",  # compare-to-empty-string