Fix PyPy tests

sample_mixed_mi ....................................................***Exception: SegFault  0.25 sec 

sample_sample ......................................................***Failed    0.47 sec
......E
======================================================================
ERROR: testStringFunctions (__main__.ModuleTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/Users/tismer/src/QtC/pyside-setup/sources/shiboken6/tests/samplebinding/sample_test.py", line 92, in testStringFunctions
    self.assertEqual(sample.addStdWStrings(t1, t1), expected)
ValueError: character U+90000000 is not in range [U+0000; U+10ffff]
sample_str .........................................................***Failed    0.14 
   testSequenceOperators:77 self.assertEqual(s1[-1], "f");
       TypeError: bad argument type for built-in operation

sample_typedealloc .................................................***Failed    0.16 sec
    79, in testDeleteType AssertionError: False is not true
    71, in testScopeEnd AssertionError: False is not true

pysidetest_homonymoussignalandmethod_test .......***Exception: SegFault  0.37 sec

pysidetest_mixin_signal_slots_test ..............***Exception: SegFault  0.29 sec

signals_qobject_sender_test .....................***Failed    0.25 sec
     130, in testSenderCppSignalWithPythonExtendedClass self.assertEqual(sender, recv.the_sender) 
          AssertionError: <__main__.ExtQTimer(0xffa370) at 0x16a9320> != None
      95, in testSenderCppSignal self.assertEqual(sender, recv.the_sender)
          AssertionError: <PySide6.QtCore.QTimer(0x1a1a190, name = "foo") at 0x16b9060> != None
     101, in testSenderCppSignalSingleShotTimer self.assertTrue(isinstance(recv.the_sender, QObject))
            AssertionError: False is not true
     109, in testSenderCppSignalWithPythonExtendedClass self.assertEqual(sender, recv.the_sender)
             AssertionError: <__main__.ExtQTimer(0x1a1d790) at 0x1005780> != None

QtCore_classinfo_test ...........................***Failed    0.20 se
      in test_dictionary @ClassInfo({'author':'pyside', 'author company':'The Qt Company'})
       TypeError: ClassInfo() takes either keyword argument(s) or a single dictionary argument

QtCore_qbytearray_test ..........................***Failed    0.25 sec
     283, in testBufferProtocol actual_bytes = bytes(byte_array)
          TypeError: 'bytes' object cannot be interpreted as an integer

QtWidgets_bug_836 ...............................***Exception: SegFault  0.39 sec

QtQml_bug_825 (SEGFAULT)

QtQml_javascript_exceptions .....................***Exception: SegFault  1.27 sec
Error in cpyext, CPython compatibility layer:
The function PyErr_Print was not supposed to fail
Fatal error in cpyext, CPython compatibility layer, calling PyErr_Print
Either report a bug or consider not using this particular extension
<SystemError object at 0x111062140>
RPython traceback:
  File "pypy_module_cpyext.c", line 12261, in wrapper_second_level__star_0_1
  File "pypy_module_cpyext_1.c", line 38331, in not_supposed_to_fail