.github/workflows/main.yml in grumlin-0.14.4 vs .github/workflows/main.yml in grumlin-0.14.5

@@ -8,11 +8,11 @@
     steps:
       - uses: actions/checkout@v2
 
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.0
+          ruby-version: "3.0"
           bundler-cache: true
 
       - name: Run the default task
         run: |
           gem install bundler -v 2.2.15
@@ -20,11 +20,11 @@
           bundle exec rubocop
   test:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby: [2.7, 3.0]
+        ruby: ["2.7", "3.0"]
     steps:
       - uses: actions/checkout@v2
 
       - uses: ruby/setup-ruby@v1
         with:
@@ -52,10 +52,10 @@
     steps:
       - uses: actions/checkout@v2
 
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.0
+          ruby-version: "3.0"
           bundler-cache: true
 
       - name: Build gem
         run: gem build