rspec.yml in csb-0.5.1

- old
+ new

@@ -16,10 +16,10 @@
       fail-fast: false
       matrix:
         ruby: [2.6, 2.7]
         gemfile: [
           "gemfiles/rails52.gemfile",
-          "gemfiles/rails60.gemfile",
+          "gemfiles/rails61.gemfile",
         ]
     steps:
     - name: Install packages
       run: |
         sudo apt update -y