Fix stale apt index in github actions (#24319)

.github/workflows/test-ruby.yml

@@ -32,7 +32,9 @@ jobs:
           node-version-file: '.nvmrc'
 
       - name: Install native Ruby dependencies
-        run: sudo apt-get install -y libicu-dev libidn11-dev
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y libicu-dev libidn11-dev
 
       - name: Set up bundler cache
         uses: ruby/setup-ruby@v1
@@ -119,6 +121,9 @@ jobs:
           path: './public'
           name: ${{ github.sha }}
 
+      - name: Update package index
+        run: sudo apt-get update
+
       - name: Install native Ruby dependencies
         run: sudo apt-get install -y libicu-dev libidn11-dev