Merge pull request #1660 from alphagov/dependabot/bundler/slimmer-18.3.0

Bump slimmer from 18.2.0 to 18.3.0

Gemfile.lock

@@ -103,8 +103,7 @@ GEM
     date (3.3.4)
     diff-lcs (1.5.0)
     docile (1.4.0)
-    domain_name (0.5.20190701)
-      unf (>= 0.0.5, < 1.0.0)
+    domain_name (0.6.20231109)
     drb (2.2.0)
       ruby2_keywords
     erubi (1.12.0)
@@ -568,12 +567,12 @@ GEM
       simplecov_json_formatter (~> 0.1)
     simplecov-html (0.12.3)
     simplecov_json_formatter (0.1.4)
-    slimmer (18.2.0)
+    slimmer (18.3.0)
       json
       nokogiri (~> 1.7)
       null_logger
       plek (>= 1.1.0)
-      rack
+      rack (>= 3.0)
       rest-client
     sprockets (4.2.1)
       concurrent-ruby (~> 1.0)
@@ -592,9 +591,6 @@ GEM
       concurrent-ruby (~> 1.0)
     uglifier (4.2.0)
       execjs (>= 0.3.0, < 3)
-    unf (0.1.4)
-      unf_ext
-    unf_ext (0.0.8.2)
     unicode-display_width (2.4.2)
     webmock (3.19.1)
       addressable (>= 2.8.0)