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/google.golang.org/grpc/stats/stats.go

@@ -59,18 +59,36 @@ func (s *Begin) IsClient() bool { return s.Client }
 
 func (s *Begin) isRPCStats() {}
 
+// PickerUpdated indicates that the LB policy provided a new picker while the
+// RPC was waiting for one.
+type PickerUpdated struct{}
+
+// IsClient indicates if the stats information is from client side. Only Client
+// Side interfaces with a Picker, thus always returns true.
+func (*PickerUpdated) IsClient() bool { return true }
+
+func (*PickerUpdated) isRPCStats() {}
+
 // InPayload contains the information for an incoming payload.
 type InPayload struct {
 	// Client is true if this InPayload is from client side.
 	Client bool
 	// Payload is the payload with original type.
-	Payload interface{}
+	Payload any
 	// Data is the serialized message payload.
 	Data []byte
-	// Length is the length of uncompressed data.
+
+	// Length is the size of the uncompressed payload data. Does not include any
+	// framing (gRPC or HTTP/2).
 	Length int
-	// WireLength is the length of data on wire (compressed, signed, encrypted).
+	// CompressedLength is the size of the compressed payload data. Does not
+	// include any framing (gRPC or HTTP/2). Same as Length if compression not
+	// enabled.
+	CompressedLength int
+	// WireLength is the size of the compressed payload data plus gRPC framing.
+	// Does not include HTTP/2 framing.
 	WireLength int
+
 	// RecvTime is the time when the payload is received.
 	RecvTime time.Time
 }
@@ -126,12 +144,18 @@ type OutPayload struct {
 	// Client is true if this OutPayload is from client side.
 	Client bool
 	// Payload is the payload with original type.
-	Payload interface{}
+	Payload any
 	// Data is the serialized message payload.
 	Data []byte
-	// Length is the length of uncompressed data.
+	// Length is the size of the uncompressed payload data. Does not include any
+	// framing (gRPC or HTTP/2).
 	Length int
-	// WireLength is the length of data on wire (compressed, signed, encrypted).
+	// CompressedLength is the size of the compressed payload data. Does not
+	// include any framing (gRPC or HTTP/2). Same as Length if compression not
+	// enabled.
+	CompressedLength int
+	// WireLength is the size of the compressed payload data plus gRPC framing.
+	// Does not include HTTP/2 framing.
 	WireLength int
 	// SentTime is the time when the payload is sent.
 	SentTime time.Time