net: TestDialTimeout failures with `connect: connection refused`

[gopherbot]

#!watchflakes
post <- pkg == "net" && test == "TestDialTimeout" && `connect: connection refused`

Issue created automatically to collect these failures.

Example (log):

--- FAIL: TestDialTimeout (0.00s)
    timeout_test.go:89: #5: dial tcp 127.0.0.1:0: connect: connection refused

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
post <- pkg == "net" && test == "TestDialTimeout"

2022-11-17 21:15 linux-amd64 go@1f4394a0 net.TestDialTimeout (log)

--- FAIL: TestDialTimeout (0.00s)
    timeout_test.go:89: #5: dial tcp 127.0.0.1:0: connect: connection refused

— watchflakes

[bcmills]

See previously #22896, #13144, #11872.
(CC @ianlancetaylor @neild)

[bcmills]

https://storage.googleapis.com/go-build-log/4a3b7751/linux-amd64-boringcrypto_9850cae1.log (a TryBot on https://go.dev/cl/453602)

[gopherbot]

Change https://go.dev/cl/524055 mentions this issue: net: avoid internal hooks in TestDialTimeout

[gopherbot]

Change https://go.dev/cl/524455 mentions this issue: net: skip TestDialTimeout subtests on Windows if Dial returns WSAECONNREFUSED