[url_launcher_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/url_launcher/url_launcher_android.

[flutter-dashboard]

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[gemini-code-assist]

Code Review

This pull request updates the url_launcher_android package to version 6.3.31 and bumps the Android Gradle Plugin dependency to 9.1.1. A critical issue was identified where the version 9.1.1 likely refers to the Gradle build tool rather than the Android Gradle Plugin, which will cause build failures as that version is not available in the Google Maven repository.

[gemini-code-assist]

The version 9.1.1 appears to be a Gradle version rather than an Android Gradle Plugin (AGP) version. AGP versions (the com.android.tools.build:gradle dependency) are currently in the 8.x range and do not follow the same versioning sequence as Gradle itself. Using a Gradle version for the AGP dependency will likely cause the build to fail because that version of the plugin does not exist in the Google Maven repository. If the intent is to upgrade the Gradle build tool to 9.1.1, you should update the distributionUrl in gradle-wrapper.properties and use a compatible AGP version (e.g., 8.7.x).