Merge pull request #608 from citizensadvice/dependabot/bundler/preserve-3.0.0

[dependabot:bundler] bump preserve from 2.1.0 to 3.0.0

Author: stringiest

Gemfile.lock

@@ -327,7 +327,7 @@ GEM
       racc
     pp (0.6.2)
       prettyprint
-    preserve (2.1.0)
+    preserve (3.0.0)
       actionpack (>= 3.2)
     prettyprint (0.2.0)
     prism (1.4.0)