Bump work-runtime dependency version implementation

Work manager dependency was updated in #1890 but missed updating the implementation

Author: jennantilla

OneSignalSDK/onesignal/notifications/build.gradle

@@ -65,7 +65,7 @@ dependencies {
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlinVersion"
     implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:1.6.4"
     implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.6.4"
-    implementation 'androidx.work:work-runtime-ktx:2.7.1'
+    implementation 'androidx.work:work-runtime-ktx:2.8.1'
 
     compileOnly('com.amazon.device:amazon-appstore-sdk:[3.0.1, 3.0.99]')