openpgp: widen dependency on idna to include 0.3 and up
The idna 0.2 to 0.3 changes are not relevant for how sequoia is using idna. We have tested this and confirmed it in debian for sequoia-openpgp 1.10.0-4.
The idna 0.2 to 0.3 changes are not relevant for how sequoia is using idna. We have tested this and confirmed it in debian for sequoia-openpgp 1.10.0-4.