For #4125: Suppress coroutine warning to fix release build

app/src/main/java/org/mozilla/fenix/settings/account/AccountSettingsFragment.kt

@@ -15,6 +15,8 @@ import androidx.preference.EditTextPreference
 import androidx.preference.Preference
 import androidx.preference.PreferenceFragmentCompat
 import kotlinx.coroutines.Dispatchers.Main
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.ObsoleteCoroutinesApi
 import kotlinx.coroutines.launch
 import mozilla.components.concept.sync.AccountObserver
 import mozilla.components.concept.sync.ConstellationState
@@ -73,6 +75,8 @@ class AccountSettingsFragment : PreferenceFragmentCompat() {
         requireComponents.analytics.metrics.track(Event.SyncAccountClosed)
     }
 
+    @ObsoleteCoroutinesApi
+    @ExperimentalCoroutinesApi
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)