Update ruby action and ubuntu version

.github/workflows/build-deploy.yml

@@ -21,7 +21,7 @@ jobs:
   build-core-site:
     needs: cancel-superseded
     name: Build core site
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     steps:
       - name: Cancel Previous Runs
         uses: styfle/[email protected]
@@ -32,22 +32,10 @@ jobs:
         uses: actions/checkout@v3
 
       - name: Set up Ruby 2.7
-        uses: actions/setup-ruby@v1
+        uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 2.7
-
-      - uses: actions/cache@v3
-        with:
-          path: /opt/hostedtoolcache/Ruby/2.7.2/x64/lib/ruby/gems
-          key: ${{ runner.os }}-gems-v3-${{ hashFiles('**/Gemfile.lock') }}
-          restore-keys: |
-            ${{ runner.os }}-gems-v3
-
-      - name: Install deps
-        run: |
-          gem update --system --no-document
-          gem install bundler jekyll
-          bundle install
+          ruby-version: '2.7'
+          bundler-cache: true # runs 'bundle install' and caches installed gems automatically
 
       - uses: actions/setup-node@v3
         with: