Update ruby.yml

Author: gaorlov

.github/workflows/ruby.yml

@@ -22,7 +22,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [2.2, 2.3, 2.4, 2.5, 2.6 2.7]
+        ruby: [2.3, 2.4, 2.5, 2.6, 2.7]
         rails: ["4.1", "4.2", "5.0", "5.2.3", "6.0"]
         exclude:
           - ruby: "2.4"