Fix ConcurrentHashMap usage in demo MediaPipeProcessor.

PiperOrigin-RevId: 465563540
(cherry picked from commit 6e4fc475)

demos/transformer/src/withMediaPipe/java/androidx/media3/demo/transformer/MediaPipeProcessor.java

@@ -69,7 +69,6 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
    * @param inputStreamName Name of the input video stream in the graph.
    * @param inputStreamName Name of the input video stream in the graph.
    * @param outputStreamName Name of the input video stream in the graph.
    * @param outputStreamName Name of the input video stream in the graph.
    */
    */
-  @SuppressWarnings("AndroidConcurrentHashMap") // Only used on API >= 23.
   public MediaPipeProcessor(
   public MediaPipeProcessor(
       Context context,
       Context context,
       boolean useHdr,
       boolean useHdr,