Change GHA to use up-to-date setup-ruby action

It seems that GHA is not longer compatible with the specific version for setup-ruby that was used before.
I'm hoping defaulting to the v1 version will fix the issue.

.github/workflows/cucumber-ruby.yml

@@ -19,8 +19,8 @@ jobs:
     - name: Set up Ruby
     # To automatically get bug fixes and new Ruby versions for ruby/setup-ruby,
     # change this to (see https://github.com/ruby/setup-ruby#versioning):
-    # uses: ruby/setup-ruby@v1
-      uses: ruby/setup-ruby@ec106b438a1ff6ff109590de34ddc62c540232e0
+      uses: ruby/setup-ruby@v1
+      # uses: ruby/setup-ruby@ec106b438a1ff6ff109590de34ddc62c540232e0
       with:
         ruby-version: 2.6
     - name: Install dependencies