test: benchmark staging-compatible engine revision

Author: Bill Leoutsakos

.github/workflows/design-diff-benchmark.yml

@@ -12,7 +12,7 @@ concurrency:
   cancel-in-progress: true
 
 env:
-  ENGINE_SHA: b4f01a741ebc769a56c1e0d0f19622b0778bb556
+  ENGINE_SHA: 9df1584ff7c243b984e5964cf58535312045b01f
 
 jobs:
   replay: