fix(virtual-device): fix mqtt crash android 12

[alessioemireni]

This PR fixes a crash with Android 12:

java.lang.IllegalArgumentException: app id: Targeting S+ (version 31 and above) requires that one of FLAG_IMMUTABLE or FLAG_MUTABLE be specified when creating a PendingIntent.
    Strongly consider using FLAG_IMMUTABLE, only use FLAG_MUTABLE if some functionality depends on the PendingIntent being mutable, e.g. if it needs to be used with inline replies or bubbles.
        at android.app.PendingIntent.checkFlags(PendingIntent.java:382)
        at android.app.PendingIntent.getBroadcastAsUser(PendingIntent.java:673)
        at android.app.PendingIntent.getBroadcast(PendingIntent.java:660)
        at org.eclipse.paho.android.service.AlarmPingSender.start(AlarmPingSender.java:76)
        at org.eclipse.paho.client.mqttv3.internal.ClientState.connected(ClientState.java:1214)
        at org.eclipse.paho.client.mqttv3.internal.ClientState.notifyReceivedAck(ClientState.java:1050)
        at org.eclipse.paho.client.mqttv3.internal.CommsReceiver.run(CommsReceiver.java:151)

[rformato]

Thanks, lgtm