Explicitly log when API requests timeout (#4861)

Currently a timeout leads to a log entry which simply states:
"Error on call http://172.30.32.1:8123/api/core/state: ". From this,
it is not immeaditly clear what the problem is. This commit adds
a log entry which explicitly states that the request timed out.

supervisor/homeassistant/api.py

@@ -107,7 +107,10 @@ async def make_request(
                         continue
                     yield resp
                     return
-            except (TimeoutError, aiohttp.ClientError) as err:
+            except TimeoutError:
+                _LOGGER.error("Timeout on call %s.", url)
+                break
+            except aiohttp.ClientError as err:
                 _LOGGER.error("Error on call %s: %s", url, err)
                 break