Debugger: Port away from deprecated getargspec

https://docs.python.org/3/whatsnew/3.11.html suggests using
getfullargspec instead.

Fixes: QTCREATORBUG-28505
Change-Id: I27199f7e2c3a070c675dce3a152d201e22a16380
Reviewed-by: hjk <hjk@qt.io>

share/qtcreator/debugger/dumper.py

@@ -2495,6 +2495,9 @@ class DumperBase():
         try:
             if funcname.startswith('qdump__'):
                 typename = funcname[7:]
+                if sys.version_info > (3,):
+                    spec = inspect.getfullargspec(function)
+                else:
                     spec = inspect.getargspec(function)
                 if len(spec.args) == 2:
                     self.qqDumpers[typename] = function