Add to realease note DefaultDrmSessionEventListener's rename.
Add to realease note DefaultDrmSessionEventListener's rename.

Its absence seems to have caused
https://github.com/google/ExoPlayer/issues/8969.

#minor-release

PiperOrigin-RevId: 375058222

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