Enabled windows-latest on GHA

Author: hsbt

.github/workflows/test.yml

@@ -18,7 +18,7 @@ jobs:
     strategy:
       matrix:
         ruby: ${{ fromJson(needs.ruby-versions.outputs.versions) }}
-        os: [ ubuntu-latest, macos-latest ]
+        os: [ ubuntu-latest, macos-latest, windows-latest ]
         experimental: [false]
     runs-on: ${{ matrix.os }}
     continue-on-error: ${{ matrix.experimental }}