Merge pull request #2250 from alphagov/dependabot/bundler/diffy-3.4.4

Author: govuk-ci

Gemfile.lock

@@ -117,7 +117,7 @@ GEM
       mongoid
     date (3.4.1)
     diff-lcs (1.6.1)
-    diffy (3.4.3)
+    diffy (3.4.4)
     docile (1.4.0)
     domain_name (0.6.20240107)
     drb (2.2.3)