🔨 Fix legacy auto_build.py (#26427)

buildroot/share/vscode/auto_build.py

@@ -1103,7 +1103,7 @@ class output_window(Text):
     else:
       try:
         temp_text = IO_queue.get(block=False)
-      except Queue.Empty:
+      except queue.Empty:
         continue_updates = False  # queue is exhausted so no need for further updates
       else:
         self.insert('end', temp_text[0], temp_text[1])
@@ -1267,6 +1267,7 @@ def main():
   global build_type
   global target_env
   global board_name
+  global Marlin_ver
 
   board_name, Marlin_ver = get_board_name()