Address some build warnings

app/src/main/java/eu/kanade/tachiyomi/AppModule.kt

@@ -1,7 +1,7 @@
 package eu.kanade.tachiyomi
 
 import android.app.Application
-import android.os.Handler
+import androidx.core.content.ContextCompat
 import eu.kanade.tachiyomi.data.cache.ChapterCache
 import eu.kanade.tachiyomi.data.cache.CoverCache
 import eu.kanade.tachiyomi.data.database.DatabaseHelper
@@ -44,7 +44,7 @@ class AppModule(val app: Application) : InjektModule {
         addSingletonFactory { Json { ignoreUnknownKeys = true } }
 
         // Asynchronously init expensive components for a faster cold start
-        Handler().post {
+        ContextCompat.getMainExecutor(app).execute {
             get<PreferencesHelper>()
 
             get<NetworkHelper>()