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/cpu/cpu_riscv64.go

@@ -3,10 +3,9 @@
 // license that can be found in the LICENSE file.
 
 //go:build riscv64
-// +build riscv64
 
 package cpu
 
-const cacheLineSize = 32
+const cacheLineSize = 64
 
 func initOptions() {}