Debugger: Drop unnecessary use of ModuleNotFoundError

That's Python 3 only, and doesn't add value here.

Change-Id: I9b1702ea8b0b0ddb090fdfc393228b4430da0b07
Task-number: QTCREATORBUG-24004
Reviewed-by: Christian Stenger <christian.stenger@qt.io>
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

share/qtcreator/debugger/dumper.py

@@ -39,7 +39,7 @@ try:
     # we do not need to hard fail in cases of partial python installation
     # that will never use this.
     import json
-except ModuleNotFoundError:
+except:
     print("Python module json not found. "
           "Native combined debugging might not work.")
     pass