Upgrade dalek to at least next-pre-release versions. #980
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This is related to #963 -- it turns out dalek only released a stable (4.0) of the curve25519 crate not the ed25519 crate -- they're still working on the latter. This PR does the work of upgrading to a prerelease state of both (4.0-rc.3 and 2.0-rc.3 respectively) which is .. probably identical API-wise to what we'll see on 4.0 and 2.0. But it's not stable yet.
I'm not 100% sure what to do here. I think it's probably better to move to their prereleases assuming an imminent and uneventful final (especially given how old and unmaintained the previous release had got). But that could also be taking a risk of immature or incompletely-tested new code we don't really want to take. Open to input.