Update release date of 2.16.1
Update release date of 2.16.1

PiperOrigin-RevId: 410255281

google/ExoPlayer,google/ExoPlayer,androidx/media,amzn/exoplayer-amazon-port,amzn/exoplayer-amazon-port,androidx/media,google/ExoPlayer,amzn/exoplayer-amazon-port,androidx/media