[release-branch.go1.25] net/url: allow IP-literals with IPv4-mapped IPv6 addresses
The security fix we applied in CL709857 was overly broad. It applied
rules from RFC 2732, which disallowed IPv4-mapped IPv6 addresses, but
these were later allowed in RFC 3986, which is the canonical URI syntax
RFC.
Revert the portion of CL709857 which restricted IPv4-mapped addresses,
and update the related tests.
Updates #75815
Fixes #75832
Change-Id: I3192f2275ad5c386f5c15006a6716bdb5282919d
Reviewed-on: https://go-review.googlesource.com/c/go/+/710375
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Ethan Lee <ethanalee@google.com>
Auto-Submit: Roland Shoemaker <roland@golang.org>
(cherry picked from commit
9db7e30bb42eed9912f5e7e9e3959f3b38879d5b)
Reviewed-on: https://go-review.googlesource.com/c/go/+/712240
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Dmitri Shuralyov <dmitshur@google.com>
TryBot-Bypass: Dmitri Shuralyov <dmitshur@google.com>