Fix Kotlin NPE

[anggrayudi]

It crashed on Android with the following error:

E/IBG-Crash: CrashReporting InstabugUncaughtExceptionHandler Caught an Unhandled Exception: java.lang.NullPointerException
    java.lang.NullPointerException
        at co.quis.flutter_contacts.FlutterContactsPlugin$onRequestPermissionsResult$2.invokeSuspend(FlutterContactsPlugin.kt:162)
        at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
        at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106)
        at android.os.Handler.handleCallback(Handler.java:938)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loopOnce(Looper.java:201)
        at android.os.Looper.loop(Looper.java:288)
        at android.app.ActivityThread.main(ActivityThread.java:7842)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)

To fix it, I added null safe call ?.

I also upgraded SDK to 31 to support the latest changes.

[joachim-quis]

Thanks @anggrayudi ! Added to 1.1.5+1.

[Ajayparmar014]

i faced this below error please solve it

The following dependencies do not satisfy the required version:
project ':flutter_contacts' -> org.jetbrains.kotlin:kotlin-gradle-plugin:1.4.0

• Try:

Run with --stacktrace option to get the stack trace.
Run with --info or --debug option to get more log output.
Run with --scan to get full insights.

• Get more help at https://help.gradle.org

BUILD FAILED in 7s
Exception: Gradle task assembleDebug failed with exit code 1
Exited (sigterm)