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/crypto/curve25519/internal/field/fe_amd64.go

@@ -1,7 +1,6 @@
 // Code generated by command: go run fe_amd64_asm.go -out ../fe_amd64.s -stubs ../fe_amd64.go -pkg field. DO NOT EDIT.
 
 //go:build amd64 && gc && !purego
-// +build amd64,gc,!purego
 
 package field
 

vendor/golang.org/x/crypto/curve25519/internal/field/fe_amd64.s

@@ -1,7 +1,6 @@
 // Code generated by command: go run fe_amd64_asm.go -out ../fe_amd64.s -stubs ../fe_amd64.go -pkg field. DO NOT EDIT.
 
 //go:build amd64 && gc && !purego
-// +build amd64,gc,!purego
 
 #include "textflag.h"
 

vendor/golang.org/x/crypto/curve25519/internal/field/fe_amd64_noasm.go

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build !amd64 || !gc || purego
-// +build !amd64 !gc purego
 
 package field
 

vendor/golang.org/x/crypto/curve25519/internal/field/fe_arm64.go

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build arm64 && gc && !purego
-// +build arm64,gc,!purego
 
 package field
 

vendor/golang.org/x/crypto/curve25519/internal/field/fe_arm64.s

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build arm64 && gc && !purego
-// +build arm64,gc,!purego
 
 #include "textflag.h"
 

vendor/golang.org/x/crypto/curve25519/internal/field/fe_arm64_noasm.go

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build !arm64 || !gc || purego
-// +build !arm64 !gc purego
 
 package field