Upgrade ruby/setup-ruby v1.268.0 -> v1.276.0 (#2046)

See:
- https://github.com/ruby/setup-ruby/releases/tag/v1.269.0
- https://github.com/ruby/setup-ruby/releases/tag/v1.270.0
- https://github.com/ruby/setup-ruby/releases/tag/v1.271.0
- https://github.com/ruby/setup-ruby/releases/tag/v1.272.0
- https://github.com/ruby/setup-ruby/releases/tag/v1.273.0
- https://github.com/ruby/setup-ruby/releases/tag/v1.274.0
- https://github.com/ruby/setup-ruby/releases/tag/v1.275.0
- https://github.com/ruby/setup-ruby/releases/tag/v1.276.0
- ruby/setup-ruby@v1.268.0...v1.276.0

Author: Picnic-DevPla-Bot

.github/workflows/deploy-website.yml

@@ -43,7 +43,7 @@ jobs:
         uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
         with:
           persist-credentials: false
-      - uses: ruby/setup-ruby@8aeb6ff8030dd539317f8e1769a044873b56ea71 # v1.268.0
+      - uses: ruby/setup-ruby@ae195bbe749a7cef685ac729197124a48305c1cb # v1.276.0
         with:
           working-directory: ./website
           bundler-cache: true