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/node_runtime/Cargo.toml

@@ -21,4 +21,4 @@ serde.workspace = true
 serde_derive.workspace = true
 serde_json.workspace = true
 smol.workspace = true
-util = { path = "../util" }
+util.workspace = true