Add bigmemtest decorator for test

Author: ByteFlowing1337

Lib/test/test_pyexpat.py

@@ -714,6 +714,7 @@ def test_change_size_2(self):
 
     @support.requires_resource('cpu')
     @support.requires_resource('walltime')
+    @support.bigmemtest(size=2**31, memuse=2, dry_run=False)
     def test_large_character_data_no_buffer_overflow(self):
         # See https://github.com/python/cpython/issues/148441
         parser = expat.ParserCreate()