[Android 16] Bump Packages to Robolectric 4.16

[jesswrd]

Last bump to robolectric. The rest were previously done by dependabot.

Partially Addresses flutter/flutter#177674
Partially Addresses flutter/flutter#163071

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Code Review

This pull request updates the Robolectric dependency to version 4.16 in the build.gradle files for the example applications within the video_player and video_player_android packages. This change standardizes the testing framework version across these related example projects.