ci.yml in karafka-sidekiq-backend-1.4.3

- old
+ new

@@ -15,9 +15,10 @@
       matrix:
         ruby:
           - '3.0'
           - '2.7'
           - '2.6'
+          - 'jruby-9.3.1.0'
         include:
           - ruby: '3.0'
             coverage: 'true'
     steps:
       - uses: actions/checkout@v2