Fix exclusion

Author: eregon

.github/workflows/test.yml

@@ -54,8 +54,8 @@ jobs:
         # Windows (note: previews are not available on Windows)
         - { os: windows-2019, ruby: '1.9' }
         - { os: windows-2022, ruby: '1.9' }
-        - { os: windows-2019, ruby: '3.4.0-preview2' }
-        - { os: windows-2022, ruby: '3.4.0-preview2' }
+        - { os: windows-2019, ruby: '3.4' } # 3.4.0-preview2
+        - { os: windows-2022, ruby: '3.4' } # 3.4.0-preview2
         - { os: windows-2019, ruby: debug }
         - { os: windows-2022, ruby: debug }
         - { os: windows-2019, ruby: truffleruby }