[fenix] Use Mozilla Android Components 8.0.0. (https://github.com/mozilla-mobile/fenix/pull/4706)

This should build and is needed right away, but taskcluster scopes are messed up right now.

buildSrc/src/main/java/Dependencies.kt

@@ -34,7 +34,7 @@ object Versions {
     const val androidx_work = "2.0.1"
     const val google_material = "1.1.0-alpha07"
 
-    const val mozilla_android_components = "8.0.0-SNAPSHOT"
+    const val mozilla_android_components = "8.0.0"
     // Note that android-components also depends on application-services,
     // and in fact is our main source of appservices-related functionality.
     // The version number below tracks the application-services version