build(video): pull in native player low-latency HLS

Bumps better_native_video_player to the frosty-patches tip, which now
carries the Twitch low-latency work: #EXT-X-TWITCH-PREFETCH segments are
promoted into real segments, EXT-X-TARGETDURATION is rewritten to the true
~2s cadence so media3 stops starving on reloads, and the LoadControl no
longer parks playback ~5s behind after a rebuffer.

Takes native live latency on Android from ~9s to ~3s. iOS is unaffected —
AVFoundation parses HLS internally, so the same rewrite needs an
AVAssetResourceLoaderDelegate to intercept the playlist.

Note the readout: getLatencyToLive() measures distance to the playlist's
live edge, while Twitch's own "Latency To Broadcaster" stat adds ingest and
packaging on top, so the two aren't directly comparable.

Refs #573

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

pubspec.lock

@@ -102,7 +102,7 @@ packages:
     description:
       path: "."
       ref: frosty-patches
-      resolved-ref: "6460859318b7b44034fe44016cddff02d0bd4c0a"
+      resolved-ref: "19c627547c227f1fc9895a5a62839e64fec689b3"
       url: "https://github.com/tommyxchow/flutter-native-video-player.git"
     source: git
     version: "0.4.11"