feature/mvi branch update compileSdkVersion to 31

[dyardy]

Warning: The plugin path_provider_android requires Android SDK version 31.
Warning: The plugin shared_preferences_android requires Android SDK version 31.
One or more plugins require a higher Android SDK version.
Fix this issue by adding the following to C:\Apps\pickupv3\android\app\build.gradle:
android {
compileSdkVersion 31
...
}