Update to ExoPlayer 2.11.4

app/src/main/java/org/schabi/newpipe/player/mediasource/ManagedMediaSource.java

@@ -1,6 +1,7 @@
 package org.schabi.newpipe.player.mediasource;
 
 import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
 
 import com.google.android.exoplayer2.source.MediaSource;
 
@@ -27,4 +28,10 @@ public interface ManagedMediaSource extends MediaSource {
      * @return whether this source is for the specified stream
      */
     boolean isStreamEqual(@NonNull PlayQueueItem stream);
+
+    @Nullable
+    @Override
+    default Object getTag() {
+        return this;
+    }
 }