restrict PyQt6 QEvent.type() monkey patching to 6.0.0

The bug that this workaround was for has been fixed in PyQt6 6.0.1.

However our feature test for the bug was faulty and triggers positive
for PyQt6 6.0.1. In other words, we would be needlessly monkey patching
where it wasn't needed.

pyqtgraph/Qt.py

@@ -387,10 +387,7 @@ if QT_LIB == PYQT6:
 
     # PyQt6 6.0.0 has a bug where it can't handle certain Type values returned
     # by the Qt library.
-    try:
-        # 213 is a known failing value
-        QtCore.QEvent.Type(213)
-    except ValueError:
+    if QtCore.PYQT_VERSION == 0x60000:
         def new_method(self, old_method=QtCore.QEvent.type):
             try:
                 typ = old_method(self)