chore(example): bump Android Gradle plugin and Kotlin toolchain

[frederikprijck]

Summary

Extracts unrelated Android toolchain maintenance from the passkeys PR (#858).

• Bump example app AGP 8.3.0 → 8.6.0 and Kotlin 1.9.10 → 1.9.22 (settings.gradle)
• Add Flutter-migrator flags android.builtInKotlin=false / android.newDsl=false (gradle.properties)
• Add generated MainActivity.configureFlutterEngine override

Context

These changes were bundled into #858 (passkeys) but are independent build-system maintenance. Splitting them out isolates the build-system risk for focused review.

Test plan

• CI Android build passes
• Example app builds and runs on Android

[coderabbitai]

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⛔ Files ignored due to path filters (3)

• auth0_flutter/example/android/app/src/main/kotlin/com/auth0/auth0_flutter_example/MainActivity.kt is excluded by !**/example/**
• auth0_flutter/example/android/gradle.properties is excluded by !**/example/**
• auth0_flutter/example/android/settings.gradle is excluded by !**/example/**

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