[DEBUG] Comment out unused cases

Author: junaruga

.github/workflows/test.yml

@@ -17,7 +17,8 @@ jobs:
       fail-fast: false
       matrix:
         ruby: ${{ fromJson(needs.ruby-versions.outputs.versions) }}
-        os: [ ubuntu-latest, macos-latest, windows-latest ]
+        # os: [ ubuntu-latest, macos-latest, windows-latest ]
+        os: [ ubuntu-latest ]
         include:
           - ruby: mswin
             os: windows-latest