CLN: tweak brittle error string check

Author: pilkibun

pandas/tests/extension/base/methods.py

@@ -323,7 +323,7 @@ def test_repeat(self, data, repeats, as_series, use_numpy):
         self.assert_equal(result, expected)
 
     @pytest.mark.parametrize('repeats, kwargs, error, msg', [
-        (2, dict(axis=1), ValueError, "'axis"),
+        (2, dict(axis=1), ValueError, "'?axis"),
         (-1, dict(), ValueError, "negative"),
         ([1, 2], dict(), ValueError, "shape"),
         (2, dict(foo='bar'), TypeError, "'foo'")])