fix: new android/kotlin versioning

[simon-the-shark]

Important

Updates Kotlin versioning by removing version declaration from android/build.gradle and adding Kotlin plugin in android/settings.gradle.

• Versioning:
  • Removes ext.kotlin_version and its usage from android/build.gradle.
  • Adds id "org.jetbrains.kotlin.android" version "2.2.20" apply false to android/settings.gradle.
• Dependencies:
  • Removes Kotlin Gradle plugin dependency from buildscript in android/build.gradle.
• Misc:
  • Adds empty dependencies {} block to android/app/build.gradle.

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