Update Gutenberg Mobile reference to alpha version

Author: fluiddot

build.gradle

@@ -13,7 +13,7 @@ ext {
     wordPressUtilsVersion = 'trunk-bc2b41b8adbd28462209bdd654cde074a36a4c0a'
     wordPressLoginVersion = 'trunk-86258aa940fe32e0d4bfd0a91fe147c80845c19b'
     aztecVersion = 'v1.6.2'
-    gutenbergMobileVersion = '5184-7abf58a254b16d41e744c3723ae9c6bb77cdd225'
+    gutenbergMobileVersion = 'v1.84.0-alpha1'
     storiesVersion = 'trunk-4926f0d5d34adf6a63bd67586a7e56420caa43da'
     aboutAutomatticVersion = 'trunk-6f46a8aa2abbfa28aa2c65f6b66969abdcf3e8c2'