test flake: enterprise/wsproxy TestWorkspaceProxyWorkspaceApps_Wsconncache/ReconnectingPTY

[matifali]

Seen in https://github.com/coder/coder/actions/runs/6006900082/job/16292158168#step:5:674

[sreya]

I'm pretty sure this was fixed by #9765 I can't reproduce it on main anymore. Tried running go test -v -failfast -timeout=30m -count=10000 -race -run TestWorkspaceProxyWorkspaceApps_Wsconncache/ReconnectingPTY/OK