[pitboss] phase 10: Track D.3 — Stub services for sinks that cross a boundary

src/dynamic/lang/python.rs

@@ -524,6 +524,7 @@ mod tests {
             sink_line: 15,
             spec_hash: "00000000deadbeef".into(),
             derivation: crate::dynamic::spec::SpecDerivationStrategy::FromFlowSteps,
+            stubs_required: vec![],
         }
     }