update GH action for Jekyll build

Author: knzai

.github/workflows/main.yml

@@ -28,7 +28,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
       - name: Setup Ruby
-        uses: ruby/setup-ruby@8575951200e472d5f2d95c625da0c7bec8217c42 # v1.161.0
+        uses: ruby/setup-ruby@v1
         with:
           ruby-version: '3.2.2' # Not needed with a .ruby-version file
           bundler-cache: true # runs 'bundle install' and caches installed gems automatically