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/security_windows.go

@@ -7,8 +7,6 @@ package windows
 import (
 	"syscall"
 	"unsafe"
-
-	"golang.org/x/sys/internal/unsafeheader"
 )
 
 const (
@@ -1341,21 +1339,14 @@ func (selfRelativeSD *SECURITY_DESCRIPTOR) copySelfRelativeSecurityDescriptor()
 		sdLen = min
 	}
 
-	var src []byte
-	h := (*unsafeheader.Slice)(unsafe.Pointer(&src))
-	h.Data = unsafe.Pointer(selfRelativeSD)
-	h.Len = sdLen
-	h.Cap = sdLen
-
+	src := unsafe.Slice((*byte)(unsafe.Pointer(selfRelativeSD)), sdLen)
+	// SECURITY_DESCRIPTOR has pointers in it, which means checkptr expects for it to
+	// be aligned properly. When we're copying a Windows-allocated struct to a
+	// Go-allocated one, make sure that the Go allocation is aligned to the
+	// pointer size.
 	const psize = int(unsafe.Sizeof(uintptr(0)))
-
-	var dst []byte
-	h = (*unsafeheader.Slice)(unsafe.Pointer(&dst))
 	alloc := make([]uintptr, (sdLen+psize-1)/psize)
-	h.Data = (*unsafeheader.Slice)(unsafe.Pointer(&alloc)).Data
-	h.Len = sdLen
-	h.Cap = sdLen
-
+	dst := unsafe.Slice((*byte)(unsafe.Pointer(&alloc[0])), sdLen)
 	copy(dst, src)
 	return (*SECURITY_DESCRIPTOR)(unsafe.Pointer(&dst[0]))
 }