deps: Pin video_player to 2.9.5

The latest version (2.10.0) makes significant changes internally
and to the test API, which would require us to investigate and
update our FakeVideoPlayerPlatform mock for tests.

So, pin to the currently used version for now.

Author: rajveermalviya

pubspec.yaml

@@ -61,7 +61,7 @@ dependencies:
   sqlite3_flutter_libs: ^0.5.13
   url_launcher: ^6.1.11
   url_launcher_android: ">=6.1.0"
-  video_player: ^2.8.3
+  video_player: 2.9.5 # TODO unpin and upgrade to latest version
   wakelock_plus: ^1.2.8
   zulip_plugin:
     path: ./packages/zulip_plugin