Python 3.14: Skip newly added stdlib file test

See #8529

tests/unit/utils/test_qtutils.py

@@ -577,7 +577,7 @@ if test_file is not None:
             qiodev.name = test_file.TESTFN
             qiodev.mode = mode
             # Create empty TESTFN file because the Python tests try to unlink
-            # it.after the test.
+            # it after the test.
             with open(test_file.TESTFN, 'w', encoding='utf-8'):
                 pass
             return qiodev
@@ -598,6 +598,9 @@ if test_file is not None:
         def testSetBufferSize(self):
             """Skip this test as setting buffer size is unsupported."""
 
+        def testDefaultBufferSize(self):
+            """Skip this test as getting buffer size is unsupported."""
+
         def testTruncateOnWindows(self):
             """Skip this test truncating is unsupported."""