openpgp: Upgrade ed25519_dalek to version 2.
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This solves the following issue reported to ed25519_dalek: https://rustsec.org/advisories/RUSTSEC-2022-0093
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Upgrade win_crypto_ng so that it allows usage of rand_core that is compatible with both win_crypto_ng and ed25519_dalek: https://github.com/emgre/win-crypto-ng/pull/48