style: format code with Gofumpt and Prettier

This commit fixes the style issues introduced in 4f5a181 according to the output
from Gofumpt and Prettier.

Details: #2643

hack/tools/deadlink/main.go

@@ -175,9 +175,9 @@ func main() {
 		errLinks map[string]int
 	}
 	// result for each file path
-	var res = map[string]result{}
+	res := map[string]result{}
 	// map of external link to avoid DOS
-	var exLinks = map[string]int{}
+	exLinks := map[string]int{}
 	for _, path := range paths {
 		b, err := file.ReadFile(path)
 		if err != nil {