assistant: Add missing `lints.workspace` (#12253)

This PR adds the missing `lints.workspace` setting to the `assistant`
crate's `Cargo.toml`.

Release Notes:

- N/A
08a3d3a0c2Marshall Bowers committed on 5/24/2024, 5:14:27 PM· committed by GitHubparent8040e43
1 file changedLine totals unavailable