CI: Use Ruby 3.3 for html-proofer

Author: lah7

.github/workflows/publish.yml

@@ -9,24 +9,13 @@ jobs:
     steps:
     - uses: actions/checkout@v4
 
-    - name: Cache RubyGems
-      uses: actions/cache@v4
-      env:
-        cache-name: rubygems
+    - uses: ruby/setup-ruby@v1
       with:
-        path: vendor/bundle
-        key: ${{ runner.os }}-${{ hashFiles('**/Gemfile.lock') }}
-
-    - name: Install Dependencies
-      run: |
-        sudo apt-get update
-        sudo apt-get install ruby ruby-dev ruby-bundler make gcc rsync
-        bundle config path vendor/bundle
-        bundle install --jobs=4
+        ruby-version: '3.3'
+        bundler-cache: true
 
     - name: Build
       run: |
-        bundle config path vendor/bundle
         scripts/build.sh
 
     - name: Proofing