flake: TestTemplatePull_LatestStdout

```
    testing.go:1267: TempDir RemoveAll cleanup: remove C:\Users\RUNNER~1\AppData\Local\Temp\TestTemplatePull_LatestStdout3583910756\001: The directory is not empty.
    stuntest.go:63: STUN server shutdown
```

https://github.com/coder/coder/actions/runs/14314934529/job/40155241678?pr=17166

Appears to be related to a file being left open in the temp directory.