fix slither yaml

.github/workflows/slither.yaml

@@ -23,12 +23,17 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v3
+        with:
+          submodules: recursive
 
       - name: Install Node.js
         uses: actions/setup-node@v2
         with:
           node-version: "18"
 
+      - name: Install Foundry
+        uses: foundry-rs/foundry-toolchain@v1
+
       - name: Install Dependencies
         run: yarn install