net/http: TestTransportMaxConnsPerHost failure with "too many dials" on windows-arm64-11

[bcmills]

--- FAIL: TestTransportMaxConnsPerHost (0.02s)
    transport_test.go:678: round 1: too many dials (https): 2 != 1
    transport_test.go:681: round 1: too many get connections (https): 2 != 1
    transport_test.go:684: round 1: too many tls handshakes (https): 2 != 1
2022/02/09 21:55:39 http: TLS handshake error from 127.0.0.1:51228: read tcp 127.0.0.1:51227->127.0.0.1:51228: wsarecv: An established connection was aborted by the software in your host machine.
FAIL
FAIL	net/http	7.785s

greplogs --dashboard -md -l -e 'FAIL: TestTransportMaxConnsPerHost .*(?:\n .*): too many' --since=2021-04-16

2022-02-09T21:50:10-20c300b/windows-arm64-11

CC @neild

[gopherbot]

Change https://go.dev/cl/483116 mentions this issue: net/http: wait forever for write results in tests