chore: update the setup ruby action to the newer one (redhat-developer#609)

Author: riccardo-forina

.github/workflows/modular-docs-check.yml

@@ -33,9 +33,9 @@ jobs:
         java-version: 15
         distribution: 'adopt' # See 'Supported distributions' for available options
     - name: Use Ruby 2.6
-      uses: actions/setup-ruby@v1
+      uses: ruby/setup-ruby@v1
       with:
-        ruby-version: 2.6
+        ruby-version: '2.6'
 
     - run: npm --prefix .build install
       name: Install Node Dependencies

.github/workflows/modular-docs-publish.yml

@@ -40,9 +40,9 @@ jobs:
           java-version: 15
           distribution: 'adopt' # See 'Supported distributions' for available options
       - name: Use Ruby 2.6
-        uses: actions/setup-ruby@v1
+        uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 2.6
+          ruby-version: '2.6'
 
       - name: Install Node Dependencies
         run: npm --prefix .build install