Add submodule checkout

Author: HudsonGraeme

.github/workflows/run_benchmarks.yml

@@ -13,9 +13,11 @@ jobs:
     runs-on: ubuntu-latest
     defaults:
       run:
-        working-directory: ../bench
+        working-directory: bench
     steps:
       - uses: actions/checkout@v4
+        with:
+          submodules: 'true'
       - uses: software-mansion/setup-scarb@v1
         with:
           scarb-version: '2.4.2'