Update to Ruby 3.2.2

There has been a change in how Ruby prints errors, which seems to have
 impacted a test that was checking stdout. The Ruby change discussion
 talks about printing unhandled errors, and in our case we're printing
 the results of an exception's `#inspect` method in a `rescue` block,
 but it seems too closely-related to be a coincidence.

Aside from making the output go all on a single line (so the newlines in
 the HEREDOC were being removed), the escape sequences were being
 double-escaped (so every `\"` became `\\"`). Putting single-quotes
 around the opening identifier avoids this issue.

Ruby language change discussion:
https://bugs.ruby-lang.org/issues/18367

.ruby-version

@@ -1 +1 @@
-3.1.2
+3.2.2

Dockerfile

@@ -1,4 +1,4 @@
-ARG ruby_version=3.1.2
+ARG ruby_version=3.2.2
 ARG base_image=ghcr.io/alphagov/govuk-ruby-base:$ruby_version
 ARG builder_image=ghcr.io/alphagov/govuk-ruby-builder:$ruby_version
 

spec/lib/tasks/taxonomy/validate_taxons_base_paths_spec.rb

@@ -145,14 +145,12 @@
       travel_to "2018-02-28T16:23:32+00:00" do
         rake "taxonomy:validate_taxons_base_paths", "and_fix"
       end
-    }.to output(<<~LOG).to_stdout_from_any_process
+    }.to output(<<~'LOG').to_stdout_from_any_process
       ✅ /level-one
       ❌    ├── /some-other-path/level-two
       ------------------------------------
       The following taxons did not match the taxon URL structure. Attempting to fix this...
-      CONTENT-ID-LEVEL-TWO /some-other-path/level-two: #<GdsApi::HTTPUnprocessableEntity: URL: https://publishing-api.test.gov.uk/v2/content/CONTENT-ID-LEVEL-TWO
-      Response body:
-      {"error":{"code":422,"message":"base path=/transport conflicts with content_id=a4038b29-b332-4f13-98b1-1c9709e216bc and locale=en","fields":{"base":["base path=/transport conflicts with content_id=a4038b29-b332-4f13-98b1-1c9709e216bc and locale=en"]}}}>
+      CONTENT-ID-LEVEL-TWO /some-other-path/level-two: #<GdsApi::HTTPUnprocessableEntity:"URL: https://publishing-api.test.gov.uk/v2/content/CONTENT-ID-LEVEL-TWO\nResponse body:\n{\"error\":{\"code\":422,\"message\":\"base path=/transport conflicts with content_id=a4038b29-b332-4f13-98b1-1c9709e216bc and locale=en\",\"fields\":{\"base\":[\"base path=/transport conflicts with content_id=a4038b29-b332-4f13-98b1-1c9709e216bc and locale=en\"]}}}">
     LOG
   end