Fix bug in Absorb and update Cargo.toml

[autquis]

With the current implementation of Poseidon, when trying to absorb a field element from a different field of sponge, there is no error and the developer would think everything is right :) The unwrap helps with making panics.

Also, I changed the repos from curves to algebra.

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[z-tech]

Sweet! Thx.

[autquis]

What is happening to this merge queue? :D