Update building-and-testing-ruby.md (github#17491)

* Update building-and-testing-ruby.md

we are deprecating actions/setup-ruby in favor of ruby/setup-ruby and our removing any reference from the docs.

* updated setup-ruby action tag

Co-authored-by: Alena Sviridenko <alenasviridenko@github.com>
Co-authored-by: Sarah Edwards <skedwards88@github.com>

content/actions/guides/building-and-testing-ruby.md

@@ -49,10 +49,7 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - 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
       with:
         ruby-version: 2.6
     - name: Install dependencies
@@ -66,7 +63,7 @@ jobs:
 
 The easiest way to specify a Ruby version is by using the `ruby/setup-ruby` action provided by the Ruby organization on GitHub. The action adds any supported Ruby version to `PATH` for each job run in a workflow. For more information see, the [`ruby/setup-ruby`](https://github.com/ruby/setup-ruby).
 
-Using either Ruby's `ruby/setup-ruby` action or GitHub's `actions/setup-ruby` action is the recommended way of using Ruby with GitHub Actions because it ensures consistent behavior across different runners and different versions of Ruby.
+Using Ruby's `ruby/setup-ruby` action is the recommended way of using Ruby with GitHub Actions because it ensures consistent behavior across different runners and different versions of Ruby.
 
 The `setup-ruby` action takes a Ruby version as an input and configures that version on the runner.
 
@@ -122,10 +119,7 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - name: Set up Ruby ${{ matrix.ruby-version }}
-    # 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
       with:
         ruby-version: ${{ matrix.ruby-version }}
     - name: Install dependencies