TUN-8052: Update go to 1.21.5

Also update golang.org/x/net and google.golang.org/grpc to fix vulnerabilities,
although cloudflared is using them in a way that is not exposed to those risks

vendor/golang.org/x/sys/windows/svc/service.go

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build windows
-// +build windows
 
 // Package svc provides everything required to build Windows service.
 package svc
@@ -13,7 +12,6 @@ import (
 	"sync"
 	"unsafe"
 
-	"golang.org/x/sys/internal/unsafeheader"
 	"golang.org/x/sys/windows"
 )
 
@@ -222,11 +220,7 @@ func serviceMain(argc uint32, argv **uint16) uintptr {
 	defer func() {
 		theService.h = 0
 	}()
-	var args16 []*uint16
-	hdr := (*unsafeheader.Slice)(unsafe.Pointer(&args16))
-	hdr.Data = unsafe.Pointer(argv)
-	hdr.Len = int(argc)
-	hdr.Cap = int(argc)
+	args16 := unsafe.Slice(argv, int(argc))
 
 	args := make([]string, len(args16))
 	for i, a := range args16 {