Merge pull request #5425 from IntersectMBO/nm/upgrade-ruby-in-gh-ci

Upgrade the version of Ruby used in GH CI to match the nix flake

Author: neilmayhew

.github/workflows/haskell.yml

@@ -272,11 +272,11 @@ jobs:
         ghc-version: ${{ matrix.ghc }}
         cabal-version: 3.14
 
-    - name: Set up Ruby 2.7
+    - name: Set up Ruby
       if: contains(fromJson(env.packages-with-ruby-cddl-tests), matrix.package)
       uses: ruby/setup-ruby@v1
       with:
-        ruby-version: 2.7
+        ruby-version: 3.3
 
     - name: Install cbor-diag and cddl
       if: contains(fromJson(env.packages-with-ruby-cddl-tests), matrix.package)