Update ruby/setup-ruby digest to 6c79f72 (#233)

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

Author: renovate[bot]

.github/workflows/ci.yml

@@ -40,7 +40,7 @@ jobs:
         run: "[ -e $APT_DEPS ] || sudo apt-get install -y --no-install-recommends $APT_DEPS"
 
       - name: Set up Ruby
-        uses: ruby/setup-ruby@f0a4d6bddd8e71bd3268c611f7ea6f41dce6d7fd
+        uses: ruby/setup-ruby@6c79f721fa26dd64559c2700086ac852c18e0756
         with:
           ruby-version: ${{matrix.ruby}}
           bundler: 'latest'
@@ -66,7 +66,7 @@ jobs:
           fetch-depth: 0
 
       - name: Set up Ruby
-        uses: ruby/setup-ruby@f0a4d6bddd8e71bd3268c611f7ea6f41dce6d7fd
+        uses: ruby/setup-ruby@6c79f721fa26dd64559c2700086ac852c18e0756
         with:
           ruby-version: 3.3