Upgrade ruby/setup-ruby v1.276.0 -> v1.286.0 (#2085)

See:
- https://github.com/ruby/setup-ruby/releases/tag/v1.286.0
- https://github.com/ruby/setup-ruby/releases/tag/v1.285.0
- https://github.com/ruby/setup-ruby/releases/tag/v1.284.0
- https://github.com/ruby/setup-ruby/releases/tag/v1.283.0
- https://github.com/ruby/setup-ruby/releases/tag/v1.282.0
- https://github.com/ruby/setup-ruby/releases/tag/v1.281.0
- https://github.com/ruby/setup-ruby/releases/tag/v1.280.0
- https://github.com/ruby/setup-ruby/releases/tag/v1.279.0
- https://github.com/ruby/setup-ruby/releases/tag/v1.278.0
- https://github.com/ruby/setup-ruby/releases/tag/v1.277.0

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@ae195bbe749a7cef685ac729197124a48305c1cb # v1.276.0
+      - uses: ruby/setup-ruby@90be1154f987f4dc0fe0dd0feedac9e473aa4ba8 # v1.286.0
         with:
           working-directory: ./website
           bundler-cache: true