chore: fix 7.0.0-beta.1 version mismatch in Gemfile.lock (#477)

Author: jeffladiray

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    forest_liana (7.0.0-beta.1)
+    forest_liana (7.0.0.pre.beta.1)
       arel-helpers
       bcrypt
       forestadmin-jsonapi-serializers (>= 0.14.0)