Update All Flutter Android Example Apps to 3.47 Template Versions

[jesswrd]

Updated all Flutter Android plugin example apps to align with newer template versions for the Flutter 3.47 release.

Partially Addresses: flutter/flutter#189381
Related to: flutter/flutter#189380

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Footnotes

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[gemini-code-assist]

Code Review

This pull request updates the Gradle wrapper version to 9.3.1, the Android application plugin version to 9.1.0, and the Kotlin Android plugin version to 2.4.0 across multiple package examples. Feedback suggests removing redundant Gradle wrapper configurations located under the android/app/gradle/ directories of the example apps to reduce maintenance overhead.

[gemini-code-assist]

The Gradle wrapper configuration under android/app/gradle/wrapper/gradle-wrapper.properties is redundant and misplaced. In a standard Flutter/Android project structure, the Gradle wrapper is located at the root of the Android project (android/gradle/wrapper/gradle-wrapper.properties), which is already present and being updated in this PR. Having a duplicate wrapper under the app subproject directory is unused and increases maintenance overhead (as seen in this PR where both files have to be updated). Consider deleting the entire android/app/gradle/ directory from this and other example apps instead of updating it.

[jesswrd]

the structure is odd but this is possibly a camera specific nuance. This does look like a duplicate directory (dupe directory; standard directory). Let me see what happens if I delete it. Tracking here.