chore!: upgrade to use sort v0.3.0

[jialinli98]

Description

Problem*

Closes #18

Summary*

Additional Context

PR Checklist*

• I have tested the changes locally.
• I have formatted the changes with Prettier and/or cargo fmt on default settings.

[TomAFrench]

This PR is introducing the same issue that the zkpassport team did on their sha1 library here. We want to avoid truncating Field types into u32 when it's more appropriate to range constrain them.

It looks like self.keys and self.linked_keys should be using u32 types rather than Field internally.