Issue mozilla-mobile#2338: Update a-c to v0.55; suppress deprecation error.

Author: mcomella

app/src/main/java/org/mozilla/tv/firefox/search/SearchEngineManagerFactory.kt

@@ -22,7 +22,7 @@ object SearchEngineManagerFactory {
     fun create(app: Application): SearchEngineManager {
         return SearchEngineManager(listOf(engineProvider)).apply {
             GlobalScope.launch {
-                @Suppress("DeferredResultUnused")
+                @Suppress("DeferredResultUnused", "DEPRECATION") // TODO load is deprecated (#2352).
                 load(app) // Call is used only for its side effects
             }
         }

build.gradle

@@ -7,7 +7,7 @@ buildscript {
     ext.architecture_components_version = '2.0.0'
     ext.kotlin_version = '1.3.31'
     ext.coroutines_version = '1.0.1'
-    ext.moz_components_version = '0.54.0'
+    ext.moz_components_version = '0.55.0'
     ext.androidx_work_version = '2.0.1'
 
     ext.robolectric_version = '4.0.2' // required for SDK 28.