Upgrade rsa to ≥0.6
I'd like to upgrade to 0.6 of the rsa crate, but for now there is a conflict with x25519-dalek: rsa wants a more recent zeroize, and x25519-dalek is pinned to an older one.
I'd like to upgrade to 0.6 of the rsa crate, but for now there is a conflict with x25519-dalek: rsa wants a more recent zeroize, and x25519-dalek is pinned to an older one.