Change amcrest camera_image to async (#21720)

Change AmcrestCam method camera_image to async so asyncio lock can be used instead of a threading lock. Bump amcrest package to 1.2.5.

homeassistant/components/amcrest/camera.py

@@ -1,6 +1,6 @@
 """Support for Amcrest IP cameras."""
+import asyncio
 import logging
-import threading
 
 from requests import RequestException
 from urllib3.exceptions import ReadTimeoutError
@@ -47,14 +47,16 @@ class AmcrestCam(Camera):
         self._stream_source = amcrest.stream_source
         self._resolution = amcrest.resolution
         self._token = self._auth = amcrest.authentication
-        self._snapshot_lock = threading.Lock()
+        self._snapshot_lock = asyncio.Lock()
 
-    def camera_image(self):
+    async def async_camera_image(self):
         """Return a still image response from the camera."""
-        with self._snapshot_lock:
+        async with self._snapshot_lock:
             try:
                 # Send the request to snap a picture and return raw jpg data
-                return self._camera.snapshot(channel=self._resolution).data
+                response = await self.hass.async_add_executor_job(
+                    self._camera.snapshot, self._resolution)
+                return response.data
             except (RequestException, ReadTimeoutError, ValueError) as error:
                 _LOGGER.error(
                     'Could not get camera image due to error %s', error)