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/go.opentelemetry.io/otel/sdk/trace/span_processor.go

@@ -62,6 +62,11 @@ type SpanProcessor interface {
 
 type spanProcessorState struct {
 	sp    SpanProcessor
-	state *sync.Once
+	state sync.Once
 }
+
+func newSpanProcessorState(sp SpanProcessor) *spanProcessorState {
+	return &spanProcessorState{sp: sp}
+}
+
 type spanProcessorStates []*spanProcessorState