Update ruby/setup-ruby action to v1.242.0 (#842)

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

Author: renovate[bot]

.github/workflows/push.yml

@@ -24,7 +24,7 @@ jobs:
           fetch-depth: 0
 
       - name: Set up Ruby
-        uses: ruby/setup-ruby@1a0ff446f5856bdfec298b61a09727c860d9d480 # v1.240.0
+        uses: ruby/setup-ruby@cb0fda56a307b8c78d38320cd40d9eb22a3bf04e # v1.242.0
         with:
           bundler-cache: false