Merge pull request #470 from yahonda/fix_test_yml

`matrix.ruby-version` should be an array

Author: takkanm

.github/workflows/test.yml

@@ -13,15 +13,17 @@ jobs:
       fail-fast: false
       matrix:
         ruby-version:
-          - '2.5',
-          - '2.6',
-          - '2.7',
-          - '3.0',
-          - '3.1',
-          - '3.2',
-          - '3.3',
-          - '3.4',
-          - 'head'
+          [
+          '2.5',
+          '2.6',
+          '2.7',
+          '3.0',
+          '3.1',
+          '3.2',
+          '3.3',
+          '3.4',
+          'head'
+          ]
 
     steps:
     - uses: actions/checkout@v3