chore: Move workspace dependencies to workspace.dependencies (#7454)

We should prefer referring to local deps via `.workspace = true` from
now on.

Release Notes:

- N/A

crates/menu/Cargo.toml

@@ -10,5 +10,5 @@ path = "src/menu.rs"
 doctest = false
 
 [dependencies]
-gpui = { path = "../gpui" }
+gpui.workspace = true
 serde = { workspace = true }