api: promote next to go1.23

api: promote next to go1.23

Change-Id: I219c59b5efc2ed7fcfdd7cd3c418635831b17b8a
Reviewed-on: https://go-review.googlesource.com/c/go/+/590835
Reviewed-by: Michael Knyszek <mknyszek@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Gopher Robot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>