ci: enable Windows support in GitHub Actions testing

- Add Windows as a supported operating system for testing in the GitHub Actions workflow

Signed-off-by: Bo-Yi Wu <[email protected]>

Author: appleboy

.github/workflows/testing.yml

@@ -41,7 +41,7 @@ jobs:
   test:
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-latest]
+        os: [ubuntu-latest, macos-latest, windows-latest]
         go: [1.24, 1.25]
         include:
           - os: ubuntu-latest