Test failures with 8.0.0 and pyqt6

Updating the Fedora traitsui package and getting the following error:
```
test_simple_editor (traitsui.tests.editors.test_instance_editor.TestInstanceEditor.test_simple_editor) ... ok
test_simple_editor_modal (traitsui.tests.editors.test_instance_editor.TestInstanceEditor.test_simple_editor_modal) ... Unexpected error captured in sys excepthook.
Traceback (most recent call last):
File "/home/orion/BUILDROOT/python-traitsui-8.0.0-1.fc39.x86_64/usr/lib/python3.11/site-packages/traitsui/qt/instance_editor.py", line 436, in edit_instance
self._dialog_ui = self.value.edit_traits(
^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib64/python3.11/site-packages/traits/has_traits.py", line 1812, in edit_traits
return view.ui(
^^^^^^^^
File "/home/orion/BUILDROOT/python-traitsui-8.0.0-1.fc39.x86_64/usr/lib/python3.11/site-packages/traitsui/view.py", line 457, in ui
ui.ui(parent, kind)
File "/home/orion/BUILDROOT/python-traitsui-8.0.0-1.fc39.x86_64/usr/lib/python3.11/site-packages/traitsui/ui.py", line 234, in ui
self.rebuild(self, parent)
File "/home/orion/BUILDROOT/python-traitsui-8.0.0-1.fc39.x86_64/usr/lib/python3.11/site-packages/traitsui/qt/toolkit.py", line 176, in ui_modal
ui_modal.ui_modal(ui, parent)
File "/home/orion/BUILDROOT/python-traitsui-8.0.0-1.fc39.x86_64/usr/lib/python3.11/site-packages/traitsui/qt/ui_modal.py", line 49, in ui_modal
_ui_dialog(ui, parent, BaseDialog.MODAL)
File "/home/orion/BUILDROOT/python-traitsui-8.0.0-1.fc39.x86_64/usr/lib/python3.11/site-packages/traitsui/qt/ui_modal.py", line 67, in _ui_dialog
BaseDialog.display_ui(ui, parent, style)
File "/home/orion/BUILDROOT/python-traitsui-8.0.0-1.fc39.x86_64/usr/lib/python3.11/site-packages/traitsui/qt/ui_base.py", line 320, in display_ui
ui.control.exec_()
^^^^^^^^^^^^^^^^
AttributeError: '_StickyDialog' object has no attribute 'exec_'

ERROR
```
and then
```
test_expand_all (traitsui.tests.editors.test_tree_editor.TestTreeView.test_expand_all) ... Traceback (most recent call last):
File "/home/orion/BUILDROOT/python-traitsui-8.0.0-1.fc39.x86_64/usr/lib/python3.11/site-packages/traitsui/qt/tree_editor.py", line 1803, in sizeHint
expanded, node, instance = self.editor._get_node_data(item)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/orion/BUILDROOT/python-traitsui-8.0.0-1.fc39.x86_64/usr/lib/python3.11/site-packages/traitsui/qt/tree_editor.py", line 803, in _get_node_data
if not qobject_is_valid(nid):
^^^^^^^^^^^^^^^^^^^^^
File "/home/orion/BUILDROOT/python-traitsui-8.0.0-1.fc39.x86_64/usr/lib/python3.11/site-packages/traitsui/qt/helper.py", line 282, in qobject_is_valid
from sip import isdeleted
ModuleNotFoundError: No module named 'sip'
Fatal Python error: Aborted

Current thread 0x00007f7a8a7e0740 (most recent call first):
File "/home/orion/BUILDROOT/python-traitsui-8.0.0-1.fc39.x86_64/usr/lib/python3.11/site-packages/traitsui/qt/tree_editor.py", line 1588 in resizeEvent
File "/home/orion/BUILDROOT/python-traitsui-8.0.0-1.fc39.x86_64/usr/lib/python3.11/site-packages/traitsui/qt/ui_base.py", line 317 in display_ui
File "/home/orion/BUILDROOT/python-traitsui-8.0.0-1.fc39.x86_64/usr/lib/python3.11/site-packages/traitsui/qt/ui_live.py", line 72 in _ui_dialog
File "/home/orion/BUILDROOT/python-traitsui-8.0.0-1.fc39.x86_64/usr/lib/python3.11/site-packages/traitsui/qt/ui_live.py", line 52 in ui_live
File "/home/orion/BUILDROOT/python-traitsui-8.0.0-1.fc39.x86_64/usr/lib/python3.11/site-packages/traitsui/qt/toolkit.py", line 168 in ui_live
File "/home/orion/BUILDROOT/python-traitsui-8.0.0-1.fc39.x86_64/usr/lib/python3.11/site-packages/traitsui/ui.py", line 234 in ui
File "/home/orion/BUILDROOT/python-traitsui-8.0.0-1.fc39.x86_64/usr/lib/python3.11/site-packages/traitsui/view.py", line 457 in ui
File "/usr/lib64/python3.11/site-packages/traits/has_traits.py", line 1812 in edit_traits
File "/home/orion/BUILDROOT/python-traitsui-8.0.0-1.fc39.x86_64/usr/lib/python3.11/site-packages/traitsui/testing/tester/ui_tester.py", line 105 in create_ui
File "/usr/lib64/python3.11/contextlib.py", line 137 in __enter__
File "/home/orion/BUILDROOT/python-traitsui-8.0.0-1.fc39.x86_64/usr/lib/python3.11/site-packages/traitsui/tests/editors/test_tree_editor.py", line 318 in test_expand_all
File "/usr/lib64/python3.11/unittest/case.py", line 579 in _callTestMethod
File "/usr/lib64/python3.11/unittest/case.py", line 623 in run
File "/usr/lib64/python3.11/unittest/case.py", line 678 in __call__
File "/usr/lib64/python3.11/unittest/suite.py", line 122 in run
File "/usr/lib64/python3.11/unittest/suite.py", line 84 in __call__
File "/usr/lib64/python3.11/unittest/suite.py", line 122 in run
File "/usr/lib64/python3.11/unittest/suite.py", line 84 in __call__
File "/usr/lib64/python3.11/unittest/suite.py", line 122 in run
File "/usr/lib64/python3.11/unittest/suite.py", line 84 in __call__
File "/usr/lib64/python3.11/unittest/suite.py", line 122 in run
File "/usr/lib64/python3.11/unittest/suite.py", line 84 in __call__
File "/usr/lib64/python3.11/unittest/runner.py", line 217 in run
File "/usr/lib64/python3.11/unittest/main.py", line 274 in runTests
File "/usr/lib64/python3.11/unittest/main.py", line 102 in __init__
File "/usr/lib64/python3.11/unittest/__main__.py", line 18 in
File "", line 88 in _run_code
File "", line 198 in _run_module_as_main

Extension modules: traits.ctraits, numpy.core._multiarray_umath, numpy.core._multiarray_tests, numpy.linalg._umath_linalg, numpy.fft._pocketfft_internal, numpy.random._common, numpy.random.bit_generator, numpy.random._bounded_integers, numpy.random._mt19937, numpy.random.mtrand, numpy.random._philox, numpy.random._pcg64, numpy.random._sfc64, numpy.random._generator, PyQt6.QtCore, PyQt6.QtGui, PyQt6.QtWidgets, PyQt6.QtPrintSupport, PyQt6.QtTest, wx._core, numpy.linalg.lapack_lite, pandas._libs.tslibs.np_datetime, pandas._libs.tslibs.dtypes, pandas._libs.tslibs.base, pandas._libs.tslibs.nattype, pandas._libs.tslibs.timezones, pandas._libs.tslibs.tzconversion, pandas._libs.tslibs.ccalendar, pandas._libs.tslibs.fields, pandas._libs.tslibs.timedeltas, pandas._libs.tslibs.timestamps, pandas._libs.properties, pandas._libs.tslibs.offsets, pandas._libs.tslibs.parsing, pandas._libs.tslibs.conversion, pandas._libs.tslibs.period, pandas._libs.tslibs.vectorized, pandas._libs.ops_dispatch, pandas._libs.missing, pandas._libs.hashtable, pandas._libs.algos, pandas._libs.interval, pandas._libs.tslib, pandas._libs.lib, pandas._libs.hashing, pyarrow.lib, pyarrow._hdfsio, pandas._libs.ops, numexpr.interpreter, pyarrow._compute, bottleneck.move, bottleneck.nonreduce, bottleneck.nonreduce_axis, bottleneck.reduce, pandas._libs.arrays, pandas._libs.index, pandas._libs.join, pandas._libs.sparse, pandas._libs.reduction, pandas._libs.indexing, pandas._libs.internals, pandas._libs.writers, pandas._libs.window.aggregations, pandas._libs.window.indexers, pandas._libs.reshape, pandas._libs.tslibs.strptime, pandas._libs.groupby, pandas._libs.testing, pandas._libs.parsers, pandas._libs.json, PyQt6.QtSvg, PyQt6.QtSvgWidgets, PIL._imaging (total: 73)
/usr/bin/xvfb-run: line 181: 118782 Aborted (core dumped) DISPLAY=:$SERVERNUM XAUTHORITY=$AUTHFILE "$@" 2>&1
```
This is with Python 3.11.3 and PyQt6 6.5.1.

Tests run with:
```
+ export QT_API=pyqt6
+ QT_API=pyqt6
+ case $toolkit in
+ export ETS_TOOLKIT=qt
+ ETS_TOOLKIT=qt
+ export EXCLUDE_TESTS=wx
+ EXCLUDE_TESTS=wx
+ xvfb-run /usr/bin/python3 -s -X faulthandler -W default -m unittest discover -v traitsui
```