ci: refine CI workflow and test configurations

- Update the Codecov GitHub action from version `v3` to `v4` in the Go workflow

Signed-off-by: appleboy <[email protected]>

.github/workflows/go.yml

@@ -62,6 +62,6 @@ jobs:
           go test -v -covermode=atomic -coverprofile=coverage.out
 
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v3
+        uses: codecov/codecov-action@v4
         with:
           flags: ${{ matrix.os }},go-${{ matrix.go }}