Update release job to use different GitHub action for setting up Ruby (…

…#439)

* Update release job to use different GitHub action for setting up Ruby

actions/setup-ruby@v1 is deprecated with suggestion to use ruby/setup-ruby@v1 instead
https://github.com/ruby/setup-ruby

* Correct syntax error in release job

every step must define a `uses` or `run` key

.github/workflows/release.yml

@@ -13,9 +13,10 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - name: Set up Ruby 2.6
-      uses: actions/setup-ruby@v1
+      uses: ruby/setup-ruby@v1
       with:
-        version: 2.6.x
+        ruby-version: 2.6 # uses the latest release matching that version (e.g., 2.6.6)
+        bundler-cache: false # when true, runs 'bundle install' and caches installed gems automatically
 
     - name: Build
       run: |