ci: enhance CI workflow and update linter version

- Update the golangci-lint-action version from v5 to v6 in the GitHub Actions workflow
- Expand the test matrix to include macOS-latest alongside ubuntu-latest in the GitHub Actions workflow

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

.github/workflows/go.yml

@@ -19,13 +19,13 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
       - name: Setup golangci-lint
-        uses: golangci/golangci-lint-action@v5
+        uses: golangci/golangci-lint-action@v6
         with:
           args: --verbose
   test:
     strategy:
       matrix:
-        os: [ubuntu-latest]
+        os: [ubuntu-latest, macos-latest]
         go: [1.18, 1.19, "1.20", 1.21, 1.22]
         include:
           - os: ubuntu-latest