test(ci): drop some old ruby ​​versions

Author: cotes2020

.github/workflows/ci.yml

@@ -22,7 +22,7 @@ jobs:
 
     strategy:
       matrix:
-        ruby: [2.5, 2.6, 2.7, 3]
+        ruby: [2.7, 3]
 
     steps:
       - name: Checkout