GPG error means your database keys are borked somehow.
Found this possible solution by searching:
forum.manjaro.org/t/error-gpgme-error-no-data-when-im-trying-to-update/77339
Discussion
nostr:npub1f7twcv30qr0jz37sp5kv3qrvx5u2u7qhe44f4ucfhsgw3ksygkrsdg3yrk I just got it to work by deleting /var/lib/pacman/sync, which I found using strace, but thank you anyway Snekbro.
