fix(ci): Use latest buildjet version

[SystemKeeper]

Summary

@susnux @skjnldsv We need to update the buildjet action, 25s now on restore, see https://github.com/nextcloud/server/actions/runs/10869657438/job/30161269276#step:2:12

We are suffering from a bug in node that keeps node running when there are unfullfilled promises, ref

• Extremely slow Post Setup steps for actions/cache@v3 actions/cache#1442
• https://github.com/actions/cache/blob/704facf57e6136b1bc63b828d79edcd491f0ee84/src/restoreImpl.ts#L102-L109

Seems that version we are using does not include the upstream fix. We can fix it to the latest hash or just use v3, as you like.

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

[skjnldsv]

They even have a v4