ruby.yml in bundler-audit-0.9.1

- old
+ new

@@ -10,10 +10,11 @@
       matrix:
         ruby:
           - 2.5
           - 2.6
           - 2.7
-          - 3.0
+          - '3.0'
+          - 3.1
           - jruby
           - truffleruby-head
     name: Ruby ${{ matrix.ruby }}
     steps:
       - uses: actions/checkout@v2