Update packages repo minimum kotlin version to the minimum version supported by the latest flutter stable

https://github.com/flutter/packages/blob/1d6c266ae19c3c284b76ede99bb820617b4a2f04/script/tool/lib/src/gradle_check_command.dart#L18

https://github.com/flutter/flutter/blob/flutter-3.35-candidate.0/packages/flutter_tools/gradle/src/main/kotlin/DependencyVersionChecker.kt#L105 