fix: resolve CI/CD test and linting issues

tests/test_parser.py

@@ -92,7 +92,7 @@ class TestParser:
         assert isinstance(ast[0], CharacterClass)
 
     def test_parse_inverted_class(self):
-        """Test parsing an inverted character class."""
+        """Test parsing an inverted class."""
         ast = parse_regex("[^abc]")
         assert len(ast) == 1
         assert isinstance(ast[0], CharacterClass)