Migrating to Gradle 9.1.0+ and AGP 9.0.0+

[manabu-nakamura]

Is your feature request related to a problem? Please describe.
Upgrade Assistant (Android Studio Otter 3 Feature Drop | 2025.2.3): The request for this plugin could not be satisfied because the plugin is already on the classpath with an unknown version, so compatibility cannot be checked.

Describe the solution you'd like
Migrating to Gradle 9.1.0+ and AGP 9.0.0+.

Additional context
#4447