Fix issue leading to truncated files while attempt to open them.
Since the release sig got pulled, we disable verification temporarily,
given that the source hash didn't change and the signature got verified
for the unpatched release at least once.
Signature verification has to be enabled for the next release.

See:
https://github.com/neomutt/neomutt/issues/3774
https://bugs.archlinux.org/task/77987

devtools 20230105-1 enables the debug option by default.

A follow-up commit will remove debug from alongside other options.

archlinux/devtools!109 (comment 74475)

Credits @diabonas
https://github.com/neomutt/neomutt/pull/3090