Merge pull request #12 from arduino/fix/APP-480-alarm

chore(phone-as-device): app-480 update paho client to v4.0

Author: alessioemireni

android/build.gradle

@@ -137,4 +137,4 @@ dependencies {
 
   // Paho MQTT
     implementation 'androidx.legacy:legacy-support-v4:1.0.0'
-    implementation 'com.github.hannesa2:paho.mqtt.android:3.3.8'}
+    implementation 'com.github.hannesa2:paho.mqtt.android:4.0'}