build: os/exec failures

[gopherbot]

#!watchflakes
default <- repo == "go" && pkg == "" && test == "os/exec"

Issue created automatically to collect these failures.

Example (log):

FAIL	os/exec	1080.081s

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- repo == "go" && pkg == "" && test == "os/exec"

2024-06-13 15:47 gotip-netbsd-arm64 go@8219848c os/exec (log)

FAIL	os/exec	1080.081s

— watchflakes

[cherrymui]

Dup of #66895