Update ruby/setup-ruby digest to f0a4d6b (#559)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ci.yml

@@ -48,7 +48,7 @@ jobs:
           docker compose up -d || (sleep 5 && docker compose up -d)
 
       - name: Set up Ruby
-        uses: ruby/setup-ruby@bbda85882f33075a3727c01e3c8d0de0be6146ce
+        uses: ruby/setup-ruby@f0a4d6bddd8e71bd3268c611f7ea6f41dce6d7fd
         with:
           ruby-version: ${{matrix.ruby}}
           bundler-cache: true
@@ -91,7 +91,7 @@ jobs:
           fetch-depth: 0
 
       - name: Set up Ruby
-        uses: ruby/setup-ruby@bbda85882f33075a3727c01e3c8d0de0be6146ce
+        uses: ruby/setup-ruby@f0a4d6bddd8e71bd3268c611f7ea6f41dce6d7fd
         with:
           ruby-version: 3.4
           bundler-cache: true