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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• [ ] Wrote unit tests
• [ ] Updated relevant documentation in the code
• [ ] Added a relevant changelog entry to the Pending section in CHANGELOG.md
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[z-tech]

Sweet! Thx.

[autquis]

What is happening to this merge queue? :D