Consistent matrix versions naming in ci workflow

Author: dalibor

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
       matrix:
         include:
           - rails: "6.0"
-            ruby: 2.7
+            ruby: "2.7"
 
           - rails: "6.1"
             ruby: "2.7"
@@ -25,18 +25,18 @@ jobs:
             ruby: "3.2"
 
           - rails: "7.0"
-            ruby: 3.1
+            ruby: "3.1"
           - rails: "7.0"
-            ruby: 3.2
+            ruby: "3.2"
 
           - rails: "7.1.1"
             ruby: "3.2"
           - rails: "7.1"
-            ruby: 3.1
-          - rails: "7.1.1"
-            ruby: 3.2
+            ruby: "3.1"
+          - rails: "7.1"
+            ruby: "3.2"
           - rails: "7.1"
-            ruby: 3.2
+            ruby: "3.2"
 
     env:
       BUNDLE_GEMFILE: gemfiles/rails_${{ matrix.rails }}.gemfile