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Implement Argon S2K support.
Description
Latest OpenPGP crypto refresh draft adds Argon support. We should implement it. See : https://datatracker.ietf.org/doc/html/draft-ietf-openpgp-crypto-refresh-04
Argon2 is available in Botan and OpenSSL since OpenSSL 3.2
https://mailarchive.ietf.org/arch/msg/openpgp/wRlPUH6Fvo2BWY5mX-k4touABpM/
https://mailarchive.ietf.org/arch/msg/openpgp/NamX4APgU6xhZhnVacoqbLUV0mg/
@antonsviridenko Thanks for noticing it, but it is not on the table until we implement and fully test v6 support.