Increase the memory limit in the test for issue #16335.

diff --cc Lib/test/test_ucn.py
index f949761ab38c326374e7883d8a58e801bc87356d,fbbe78b3166e970762b1d7595e42f85085e94bfa..2e6374561facdd69739e4f90226c0a081e1bfd0c
--- 1/Lib/test/test_ucn.py
--- 2/Lib/test/test_ucn.py
+++ b/Lib/test/test_ucn.py
@@@ -219,7 -145,7 +219,7 @@@ class UnicodeNamesTest(unittest.TestCas
      @unittest.skipUnless(_testcapi.INT_MAX < _testcapi.PY_SSIZE_T_MAX,
                           "needs UINT_MAX < SIZE_MAX")
      @support.bigmemtest(size=_testcapi.UINT_MAX + 1,
-                         memuse=1 + 1, dry_run=False)
 -                        memuse=2 + 4 // len('\U00010000'), dry_run=False)
++                        memuse=2 + 1, dry_run=False)
      def test_issue16335(self, size):
          # very very long bogus character name
          x = b'\\N{SPACE' + b'x' * (_testcapi.UINT_MAX + 1) + b'}'