cmd: update vendored golang.org/x/mod
Pull in CL 500335. It teaches modfile.IsDirectoryPath to recognize all
relative paths that begin with a "." or ".." path element as a valid
directory path (rather than a module path). This allows removing the
path == "." check that CL 389298 added to modload.ToDirectoryPath.
go get golang.org/x/mod@
6e58e47c # CL 500335
go mod tidy
go mod vendor
Updates #51448.
Fixes #60572.
Change-Id: Ide99c728c8dac8fd238e13f6d6a0c3917d7aea2d
Cq-Include-Trybots: luci.golang.try:gotip-linux-amd64-longtest
Reviewed-on: https://go-review.googlesource.com/c/go/+/500355
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>