.github/workflows/ubuntu-rvm.yml in yao-0.15.0 vs .github/workflows/ubuntu-rvm.yml in yao-0.16.0

@@ -5,10 +5,10 @@
 jobs:
   build:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby: [ 'ruby-3.0.3' ]
+        ruby: [ 'ruby-3.1.1' ]
     steps:
     - uses: actions/checkout@master
     - name: Set up RVM
       run: |
         curl -sSL https://get.rvm.io | bash