fixup! feat: Add support for Python 3.13

Author: otetard

tests/test_charliterals.py

@@ -37,4 +37,4 @@ def test_character_class_literals(self):
         try:
             re.match("[\911]", "")
         except Exception as exp:
-            assert exp.msg == "invalid group reference 91 at position 1"
+            assert exp.msg == "invalid escape sequence: \9"