VSCode: Use port 39999 to test for debugger readiness.

contrib/.vscode/scripts/VSCodeAutostartDebug.FCMacro

@@ -13,6 +13,6 @@ debugpy.listen(('localhost', 5678))
 # https://github.com/microsoft/debugpy/issues/974
 # Open another port that the script WaitForDebugpy can probe to see if
 # debugpy is running
-listener = Listener(('localhost', 6000), backlog=10)
+listener = Listener(('localhost', 39999), backlog=10)
 
 debugpy.wait_for_client()

contrib/.vscode/scripts/WaitForDebugpy.py

@@ -16,7 +16,7 @@ def main():
     # DO NOT CHECK 5678 or debugpy will break
     # Check other port manually opened instead
     attempt_counter = 0
-    while (not check_socket('localhost', 6000)) and attempt_counter < MAX_ATTEMPTS:
+    while (not check_socket('localhost', 39999)) and attempt_counter < MAX_ATTEMPTS:
         time.sleep(RETRY_DELAY_S)
         attempt_counter += 1