Update golang.org/x/net to the tip of internal-branch.go1.20-vendor to
include CL 468336.
The contents of that CL were already merged into this branch in CL
468122, so this CL just brings go.mod back in line to matching the
actual vendored content.
For #58356
For #57855
Change-Id: I6ee9483077630c11c725927f38f6b69a784106db
Reviewed-on: https://go-review.googlesource.com/c/go/+/468302
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Than McIntosh <thanm@google.com>
Auto-Submit: Michael Pratt <mpratt@google.com>