fix: reduce IoT client refresh interval to 50 minutes

AWS Cognito credentials expire after ~1 hour, but the MQTT client was only
refreshing every 8 hours. This caused devices to silently stop responding
to commands after credentials expired.

Fixes #59

Author: dgreif

.changeset/full-horses-fail.md

@@ -0,0 +1,5 @@
+---
+'homebridge-hatch-baby-rest': patch
+---
+
+Refresh aws token every 50 minutes instead of 8 hours

packages/homebridge-hatch-baby-rest/api.ts

@@ -43,7 +43,7 @@ const knownProducts: Product[] = [
     Product.grow,
     Product.answeredReader,
   ],
-  iotClientRefreshPeriod = 8 * 60 * 60 * 1000 // refresh client every 8 hours
+  iotClientRefreshPeriod = 50 * 60 * 1000 // refresh client every 50 minutes (AWS Cognito credentials expire after ~1 hour)
 
 export class HatchBabyApi {
   public readonly config