check.yml in ably-1.2.1

- old
+ new

@@ -8,10 +8,10 @@
   check:
     runs-on: ubuntu-latest
     continue-on-error: true
     strategy:
       matrix:
-        ruby: [ '2.5', '2.6', '2.7', '3.0' ]
+        ruby: [ '2.7', '3.0', '3.1' ]
         protocol: [ 'json', 'msgpack' ]
     steps:
       - uses: actions/checkout@v2
         with:
           submodules: 'recursive'