Use PlatformIO 4 default dir structure (#14879)

Marlin/src/HAL/HAL_LPC1768/upload_extra_script.py

@@ -17,7 +17,7 @@ def print_error(e):
     print('\nUnable to find destination disk (' + e + ')\n' \
           'Please select it in platformio.ini using the upload_port keyword ' \
           '(https://docs.platformio.org/en/latest/projectconf/section_env_upload.html) ' \
-          'or copy the firmware (.pioenvs/' + env.get('PIOENV') + '/firmware.bin) manually to the appropriate disk\n')
+          'or copy the firmware (.pio/build/' + env.get('PIOENV') + '/firmware.bin) manually to the appropriate disk\n')
 
 try:
     if current_OS == 'Windows':