Bump AGP to 8.11.1 for Flutter quickstart build

[brionmario]

Summary

• Bump Android Gradle Plugin from 8.2.2 to 8.11.1 and the Kotlin Android plugin to 2.2.20 in the quickstart's settings.gradle.kts, and bump the library module's android/build.gradle AGP classpath to match.
• CI was failing flutter build apk --debug because AGP 8.2.2 is below Flutter's current minimum supported AGP version (8.6.0).

Test plan

• CI assembleDebug task passes on this branch

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Review details

⚙️ Run configuration

Configuration used: defaults

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Run ID: 12df2fe2-8343-402f-8368-4d81980e7c3f

📥 Commits

Reviewing files that changed from the base of the PR and between 0c47688 and 8c1927f.

📒 Files selected for processing (2)

• android/build.gradle
• samples/quickstart/android/settings.gradle.kts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/agp-version-bump

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[github-actions]

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Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Scanned Files

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