refactor: Use Object.hash instead of hashCode ^

lib/src/voip/backend/livekit_backend.dart

@@ -462,8 +462,11 @@ class LiveKitBackend extends CallBackend {
           livekitAlias == other.livekitAlias;
 
   @override
-  int get hashCode =>
-      type.hashCode ^ livekitServiceUrl.hashCode ^ livekitAlias.hashCode;
+  int get hashCode => Object.hash(
+        type.hashCode,
+        livekitServiceUrl.hashCode,
+        livekitAlias.hashCode,
+      );
 
   /// get everything else from your livekit sdk in your client
   @override

lib/src/voip/models/call_membership.dart

@@ -103,15 +103,16 @@ class CallMembership {
           membershipId == other.membershipId;
 
   @override
-  int get hashCode =>
-      userId.hashCode ^
-      roomId.hashCode ^
-      callId.hashCode ^
-      application.hashCode ^
-      scope.hashCode ^
-      backend.type.hashCode ^
-      deviceId.hashCode ^
-      membershipId.hashCode;
+  int get hashCode => Object.hash(
+        userId.hashCode,
+        roomId.hashCode,
+        callId.hashCode,
+        application.hashCode,
+        scope.hashCode,
+        backend.type.hashCode,
+        deviceId.hashCode,
+        membershipId.hashCode,
+      );
 
   // with a buffer of 1 minute just incase we were slow to process a
   // call event, if the device is actually dead it should

lib/src/voip/models/call_participant.dart

@@ -35,5 +35,5 @@ class CallParticipant {
           deviceId == other.deviceId;
 
   @override
-  int get hashCode => userId.hashCode ^ deviceId.hashCode;
+  int get hashCode => Object.hash(userId.hashCode, deviceId.hashCode);
 }

lib/src/voip/models/voip_id.dart

@@ -20,5 +20,5 @@ class VoipId {
       other is VoipId && roomId == other.roomId && callId == other.callId;
 
   @override
-  int get hashCode => roomId.hashCode ^ callId.hashCode;
+  int get hashCode => Object.hash(roomId.hashCode, callId.hashCode);
 }