Change submodule initialization path from labs to sim

Author: menotti

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
       - name: Initialize and update submodules for labs/*
         run: |
           git submodule init
-          for sm in labs/*; do
+          for sm in sim/*; do
             if [ -d "$sm" ]; then
               git submodule update --init --depth=1 -- "$sm"
             fi