Migrated AGP to v9.0.0, tweaked gradle.properties

gradle.properties

@@ -1,6 +1,5 @@
 # Configure your build environment: http://www.gradle.org/docs/current/userguide/build_environment.html
-android.useAndroidX=true
-kotlin.code.style=official
+android.disallowKotlinSourceSets=false
 org.gradle.caching=true
 org.gradle.jvmargs=-Xmx6g -XX:MaxMetaspaceSize=1g -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF-8
 org.gradle.parallel=true