fix: update ascon to 0.5 - #206
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ascon 0.5 removed the State struct's byte accessors (State::from(&[u8; 40]) and as_bytes); State is now a plain [u64; 5] and the permutation is exposed as free functions like permute12. The Ascon12 permutation now converts between bytes and words explicitly with u64::from_le_bytes/to_le_bytes, mirroring the KeccakF1600 module, and a known-answer test pins the little-endian state layout on any target. Supersedes #135 while preserving its little-endian byte-order handling, without the raw pointer copies.