Refs #30116 -- Simplified regex match group access with Match.__getitem__().

The method has been available since Python 3.6. The shorter syntax is
also marginally faster.

tests/backends/sqlite/tests.py

@@ -131,7 +131,7 @@ class SchemaTests(TransactionTestCase):
         self.assertIsNotNone(match)
         self.assertEqual(
             'integer NOT NULL PRIMARY KEY AUTOINCREMENT',
-            match.group(1),
+            match[1],
             'Wrong SQL used to create an auto-increment column on SQLite'
         )