chore: update build directives

flock_aix.go

@@ -13,7 +13,7 @@
 // This code is adapted from the Go package:
 // cmd/go/internal/lockedfile/internal/filelock
 
-//+build aix
+//go:build aix
 
 package flock
 

flock_unix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by the BSD 3-Clause
 // license that can be found in the LICENSE file.
 
-// +build !aix,!windows
+//go:build !aix && !windows
 
 package flock
 
@@ -171,8 +171,9 @@ retry:
 
 // reopenFDOnError determines whether we should reopen the file handle
 // in readwrite mode and try again. This comes from util-linux/sys-utils/flock.c:
-//  Since Linux 3.4 (commit 55725513)
-//  Probably NFSv4 where flock() is emulated by fcntl().
+//
+//	Since Linux 3.4 (commit 55725513)
+//	Probably NFSv4 where flock() is emulated by fcntl().
 func (f *Flock) reopenFDOnError(err error) (bool, error) {
 	if err != syscall.EIO && err != syscall.EBADF {
 		return false, nil

flock_winapi.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by the BSD 3-Clause
 // license that can be found in the LICENSE file.
 
-// +build windows
+//go:build windows
 
 package flock