ci: ignore #\r in Fuzz (#4766)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: cobaltt7

scripts/fuzz.py

@@ -38,6 +38,11 @@
 def test_idempotent_any_syntatically_valid_python(
     src_contents: str, mode: black.FileMode
 ) -> None:
+    if (
+        "#\r" in src_contents or "\\\n" in src_contents
+    ) and black.Preview.normalize_cr_newlines not in mode:
+        return
+
     # Before starting, let's confirm that the input string is valid Python:
     compile(src_contents, "<string>", "exec")  # else the bug is in hypothesmith