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/github.com/grpc-ecosystem/grpc-gateway/v2/internal/httprule/fuzz.go

@@ -1,10 +1,10 @@
+//go:build gofuzz
 // +build gofuzz
 
 package httprule
 
 func Fuzz(data []byte) int {
-	_, err := Parse(string(data))
-	if err != nil {
+	if _, err := Parse(string(data)); err != nil {
 		return 0
 	}
 	return 0