[video_player_android] Bump gradle plugin to 9.1.1

[camsim99]

Bumps com.android.tools.build:gradle from 8.13.1 to 9.1.1 in packages/video_player/video_player_android.

[flutter-dashboard]

It looks like this pull request may not have tests. Please make sure to add tests or get an explicit test exemption before merging.

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[gemini-code-assist]

Code Review

This pull request updates the video_player_android package to version 2.9.6, which includes bumping the Android Gradle Plugin from 8.13.1 to 9.1.1. A review comment suggests that this major version upgrade may require corresponding updates to the Gradle wrapper and the JDK version to ensure build compatibility.

[gemini-code-assist]

Bumping the Android Gradle Plugin (AGP) to a major version (9.x) typically requires a corresponding update to the Gradle wrapper version (to 9.0 or higher) and the JDK version used to run the build (to JDK 21 or higher). While the compileOptions can remain at Java 17, the build environment itself must be compatible with AGP 9.x requirements to avoid build failures.