Use crypton instead of deprecated cryptonite

[dancewithheart]

This replaces deprecated cryptohash with crypton (see: yesodweb/wai#931, kazu-yamamoto/crypton#5 (comment), commercialhaskell/stack#6200 and commercialhaskell/stackage#7474).

Also cabal-audit reports:

Hackage package cryptonite at version 0.30 is vulnerable for:
  HSEC-2025-0002 "Double Public Key Signing Function Oracle Attack on Ed25519"
  published: 2025-11-14 14:45:34 UTC
  https://haskell.github.io/security-advisories/advisory/HSEC-2025-0002
  No fix version available
  crypto

this silence this warning.

I think mongodb is not affected by HSEC-2025-0002 - it does not uses Ed25519 signing.

[dancewithheart]

Hi @VictorDenisov, sorry for the direct ping. I noticed you recently merged changes here, so I wanted to ask whether this PR looks reasonable.

This would help also `persistent

persistent-mongoDB -> mongoDB -> cryptohash -> cryptonite