api: promote next to go1.25

api: promote next to go1.25

Change-Id: I96dd383ea0bf0b69d2d9058334b4bbcfbe50c77c
Reviewed-on: https://go-review.googlesource.com/c/go/+/676895
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Gopher Robot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>