chore: migrate irma 0.2.1 → irmars 0.2.2 (align Rust IRMA lib with pg-pkg)

[rubenhensen]

Surfaced by the PostGuard compat drift-check (encryption4all/postguard#201, Phase 3).

cryptify depends on the legacy irma crate at 0.2.1:

irma = "0.2.1"

while pg-pkg migrated to irmars 0.2.2 in encryption4all/postguard#192:

irma = { package = "irmars", version = "0.2.2" }

Two independent PostGuard services now speak to Yivi through different crates at different versions. Align cryptify onto irmars 0.2.2.

Tracked by the compat manifest (compat/manifest.json) in postguard-e2e; the drift-check stays green via a knownDrift entry until this lands, then the check will require the entry be removed.