fix(api): add 10s delay after updating the plate reader to give time …

…to re-initialize.

api/src/opentrons/hardware_control/modules/absorbance_reader.py

@@ -312,6 +312,8 @@ async def update_device(self, firmware_file_path: str) -> Tuple[bool, str]:
         log.debug(f"Updating {self.name}: {self.port} with {firmware_file_path}")
         self._updating = True
         success, res = await self._driver.update_firmware(firmware_file_path)
+        # it takes time for the plate reader to re-init after an update.
+        await asyncio.sleep(10)
         self._device_info = await self._driver.get_device_info()
         await self._poller.start()
         self._updating = False