Bump ruby/setup-ruby from 1.278.0 to 1.287.0 in the all-actions group (#30)

Bumps the all-actions group with 1 update: [ruby/setup-ruby](https://github.com/ruby/setup-ruby).


Updates `ruby/setup-ruby` from 1.278.0 to 1.287.0
- [Release notes](https://github.com/ruby/setup-ruby/releases)
- [Changelog](https://github.com/ruby/setup-ruby/blob/master/release.rb)
- [Commits](ruby/setup-ruby@4c24fa5...8d27f39)

---
updated-dependencies:
- dependency-name: ruby/setup-ruby
  dependency-version: 1.287.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: all-actions
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/github-pages.yml

@@ -16,7 +16,7 @@ jobs:
       - name: 📂 setup
         uses: actions/checkout@v6
       - name: 💎 setup ruby
-        uses: ruby/setup-ruby@4c24fa5ec04b2e79eb40571b1cee2a0d2b705771 # v1.278.0
+        uses: ruby/setup-ruby@8d27f39a5e7ad39aebbcbd1324f7af020229645c # v1.287.0
         with:
           ruby-version: 2.7
       - name: 🔨 install dependencies & build site