[rubygems/rubygems] Indent github workflow steps for generated gems

https://github.com/rubygems/rubygems/commit/a1784e2efa

lib/bundler/templates/newgem/github/workflows/main.yml.tt

@@ -17,21 +17,21 @@ jobs:
           - '<%= RUBY_VERSION %>'
 
     steps:
-    - uses: actions/checkout@v4
+      - uses: actions/checkout@v4
 <%- if config[:ext] == 'rust' -%>
-    - name: Set up Ruby & Rust
-      uses: oxidize-rb/actions/setup-ruby-and-rust@v1
-      with:
-        ruby-version: ${{ matrix.ruby }}
-        bundler-cache: true
-        cargo-cache: true
-        rubygems: '<%= ::Gem.rubygems_version %>'
+      - name: Set up Ruby & Rust
+        uses: oxidize-rb/actions/setup-ruby-and-rust@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
+          bundler-cache: true
+          cargo-cache: true
+          rubygems: '<%= ::Gem.rubygems_version %>'
 <%- else -%>
-    - name: Set up Ruby
-      uses: ruby/setup-ruby@v1
-      with:
-        ruby-version: ${{ matrix.ruby }}
-        bundler-cache: true
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
+          bundler-cache: true
 <%- end -%>
-    - name: Run the default task
-      run: bundle exec rake
+      - name: Run the default task
+        run: bundle exec rake