bpo-40334: Don't skip test_parser:test_trigget_memory_error (GH-19744)

This test has been changed to always use the old parser, so no need for it to be skipped.

Lib/test/test_parser.py

@@ -900,7 +900,6 @@ class ParserStackLimitTestCase(unittest.TestCase):
         st = parser.expr(e)
         st.compile()
 
-    @support.skip_if_new_parser("Pegen does not trigger memory error with this many parenthesis")
     def test_trigger_memory_error(self):
         e = self._nested_expression(100)
         rc, out, err = assert_python_failure('-Xoldparser', '-c', e)