message: add gripper node id
diff: @@ -20,11 +20,13 @@ class NodeId(int, Enum):
  head = 0x50
  head_l = 0x51
  head_r = 0x52
  + gripper = 0x20
  pipette_left_bootloader = pipette_left | 0xF
  pipette_right_bootloader = pipette_right | 0xF
  gantry_x_bootloader = gantry_x | 0xF
  gantry_y_bootloader = gantry_y | 0xF
  head_bootloader = head | 0xF
  + gripper_bootloader = gripper | 0xF
  @unique
  