Golang net: new test TestIPv4WriteMsgUDPAddrPortTargetAddrIPVersion fails on plan9 [1.25 backport]

@millerresearch requested issue #75017 to be considered for backport to the next 1.25 minor release.

@gopherbot please consider this for backport to 1.24 and 1.25

CL 689976, which caused this issue by breaking the plan9 gotip builders, has been backported to 1.24 and 125. So the plan9 builders for those branches are now broken too.

Comment From: gopherbot

Change https://go.dev/cl/704280 mentions this issue: [release-branch.go1.25] net: skip TestIPv4WriteMsgUDPAddrPort on plan9

Comment From: gopherbot

Closed by merging CL 704280 (commit a86792b16938bd5f20d56e815556bbc135371fb5) to release-branch.go1.25.