misc/58252: releng anita testbed is not running tests on sparc64

[campbell+netbsd%mumble.net@localhost]

>Number:         58252
>Category:       misc
>Synopsis:       releng anita testbed is not running tests on sparc64
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    misc-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun May 12 21:20:00 +0000 2024
>Originator:     Taylor R Campbell
>Release:        current
>Organization:
The NetBSD Sparcanitation
>Environment:
>Description:
The sparc64 tests haven't run since 2024-04-24:

https://releng.netbsd.org/b5reports/sparc64/commits-2024.04.html#2024.04.24.02.27.33

gson said this is because bracket is now finding two install ISOs; presumably there was previously only one.
>How-To-Repeat:

>Fix:
Yes, please!