fix: update go:build lines

Okabe-Junya · Okabe-Junya · commit faf677bc4896 · 2024-06-19T02:57:06.000+09:00
diff --git a/helpers_unix.go b/helpers_unix.go
@@ -1,4 +1,4 @@
-// +build !windows
+//go:build !windows
 
 package main
 
diff --git a/helpers_windows.go b/helpers_windows.go
@@ -1,4 +1,4 @@
-// +build windows
+//go:build windows
 
 package main
 
