Merge pull request #65 from Shopify/fix-ci

Switch to v1 of the ruby/setup-ruby GitHub action

Author: tomstuart

.github/workflows/ruby.yml

@@ -21,10 +21,7 @@ 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