Remove outdated audit-as-crates-io policies

[jeffcharles]

Description of the change

Removes a few outdated audit-as-crates-io cargo vet policies.

Why am I making this change?

We no longer use forks of these crates and continuing to include these policies stops cargo vet from working (but cargo vet --locked does continue to work which is why CI didn't catch this).

Checklist

• I've updated the relevant CHANGELOG files if necessary. Changes to javy-cli and javy-core do not require updating CHANGELOG files.
• I've updated the relevant crate versions if necessary. Versioning policy for library crates
• I've updated documentation including crate documentation if necessary.