Build failure due to util-linux downgrade/fstrim command

Just saw that the machines were not building anymore due to the downgrade of util-linux messing with device-mapper (or kernel - https://gitlab.archlinux.org/archlinux/arch-boxes/-/jobs/29175#L744). The problem is that the patch for the fstrim command is not yet integrated & backported to 5.12, so if we revert the downgrade, the same problem as before arises (https://gitlab.archlinux.org/archlinux/arch-boxes/-/jobs/26092#L1121).

If the downgrade of util-linux is not done and the fstrim command is not executed the build works again (without being trimmed, of course).

Should we wait for the kernel update and revert the downgrade or try to downgrade something else (I didn't manage to correctly do it yet...)?