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

Marshall Bowers created

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

Release Notes:

- N/A

Change summary

crates/assistant/Cargo.toml | 3 +++
1 file changed, 3 insertions(+)

Detailed changes

crates/assistant/Cargo.toml 🔗

@@ -5,6 +5,9 @@ edition = "2021"
 publish = false
 license = "GPL-3.0-or-later"
 
+[lints]
+workspace = true
+
 [lib]
 path = "src/assistant.rs"
 doctest = false