[racket] aws/glacier: credential scope

>> I clicked "update" on pkgs.racket-lang.org. But it seems to be slower
>> than usual to refresh. After it does, you can `raco pkg update aws` to
>> get the fix.
>
> Something seems wrong/stuck on pkgs.racket-lang.org. The top of the page says:
>
>   "update upload in progress: there may be inconsistencies below"
>
> It's been saying that for nearly an hour.

Sometimes instead it says:

  "update upload being computed: the information below may not
represent all recent changes and updates"

It has switched between those two messages at various intervals over
the last hour.