sweet: upgrade cockroachdb to v25.2.0 and re-enable

This is a new release. It looks OK to me locally, so perhaps whatever
was ailing us is now gone. I hope. Famous last words but, it's a flaky
failure, so I think we might just have to try.

Fixes golang/go#73474.

Change-Id: I5153f428037813e80c4eefca563f95cbb500938a
Reviewed-on: https://go-review.googlesource.com/c/benchmarks/+/679755
Reviewed-by: Carlos Amedee <carlos@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Michael Knyszek <mknyszek@google.com>
2 files changed