fix: default compile Android SDK version 31

Author: fabriziomoscon

android/build.gradle

@@ -25,7 +25,7 @@ allprojects {
 apply plugin: 'com.android.library'
 
 def DEFAULT_MIN_SDK_VERSION = 23
-def DEFAULT_COMPILE_SDK_VERSION = 30
+def DEFAULT_COMPILE_SDK_VERSION = 31
 def DEFAULT_BUILD_TOOLS_VERSION = "29.0.3"
 def DEFAULT_TARGET_SDK_VERSION = 29
 def DEFAULT_SUPPORT_LIB_VERSION = "29.0.3"

android/src/main/java/com/hoxfon/react/RNTwilioVoice/CallNotificationManager.java

@@ -81,7 +81,7 @@ public void createMissedCallNotification(ReactApplicationContext context, String
                 context,
                 0,
                 intent,
-                PendingIntent.FLAG_UPDATE_CURRENT
+                PendingIntent.FLAG_IMMUTABLE | PendingIntent.FLAG_UPDATE_CURRENT
         );
 
         PendingIntent clearMissedCallsCountPendingIntent = PendingIntent.getBroadcast(
@@ -155,15 +155,15 @@ public void createHangupNotification(ReactApplicationContext context, String cal
                 context,
                 0,
                 intent,
-                PendingIntent.FLAG_UPDATE_CURRENT
+                PendingIntent.FLAG_IMMUTABLE | PendingIntent.FLAG_UPDATE_CURRENT
         );
 
         PendingIntent hangupPendingIntent = PendingIntent.getBroadcast(
                 context,
                 0,
                 new Intent(Constants.ACTION_HANGUP_CALL)
                         .putExtra(Constants.INCOMING_CALL_NOTIFICATION_ID, Constants.HANGUP_NOTIFICATION_ID),
-                PendingIntent.FLAG_UPDATE_CURRENT
+                PendingIntent.FLAG_IMMUTABLE | PendingIntent.FLAG_UPDATE_CURRENT
         );
 
         Bundle extras = new Bundle();