Bump ruby version to 3.4

Author: djmb

.github/workflows/main.yml

@@ -17,7 +17,7 @@ jobs:
       - name: Setup Ruby and install gems
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.3.0
+          ruby-version: 3.4.1
           bundler-cache: true
       - name: Run Rubocop
         run: bundle exec rubocop --parallel
@@ -31,7 +31,7 @@ jobs:
         gemfile: [ rails_7_2, rails_8_0, rails_main ]
         database: [sqlite, postgres, mysql]
         exclude:
-          - ruby-version: "3.1"
+          - ruby-version: "3.4"
             gemfile: rails_main
     services:
       redis: