x/playground: playground times out when executing simple snippet about go

[cagedmantis]

I've been able to reproduce these results. I was able to successfully run the snippet above once out of ten attempts.

@toothrot @golang/tools-team

[H0llyW00dzZ]

Go version

go1.21

Output of go env in your module/workspace:

N/A

What did you do?

I've tried to run the code on Go Playground.

https://go.dev/play/p/k82r6VIVJO1?v=goprev

package main

import "fmt"

func main() {
	fmt.Println("a")
}

What did you see happen?

The program is failed to build due to timeout.

### What did you expect to see? It succeed to run the program with using Go 1.21 on Go Playground.

The same issue occurred for me as well. Other Go versions (Go 1.22 and the development branch) are working fine.