Windows doesn’t have 4.0 preview

Author: soutaro

.github/workflows/windows.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: ['3.4', '4.0.0-preview2', ucrt, mswin]
+        ruby: ['3.4', ucrt, mswin]
     steps:
       - uses: actions/checkout@v6
       - name: load ruby