Upgrade ruby/setup-ruby v1.206.0 -> v1.213.0 (#1533)

See:
- https://github.com/ruby/setup-ruby/releases/tag/v1.213.0
- https://github.com/ruby/setup-ruby/releases/tag/v1.212.0
- https://github.com/ruby/setup-ruby/releases/tag/v1.211.0
- https://github.com/ruby/setup-ruby/releases/tag/v1.210.0
- https://github.com/ruby/setup-ruby/releases/tag/v1.209.0
- https://github.com/ruby/setup-ruby/releases/tag/v1.208.0
- https://github.com/ruby/setup-ruby/releases/tag/v1.207.0

.github/workflows/deploy-website.yml

@@ -43,7 +43,7 @@ jobs:
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
           persist-credentials: false
-      - uses: ruby/setup-ruby@bfefad842bb982ff05b233bcbc1571d97a87e69f # v1.206.0
+      - uses: ruby/setup-ruby@28c4deda893d5a96a6b2d958c5b47fc18d65c9d3 # v1.213.0
         with:
           working-directory: ./website
           bundler-cache: true