ci: Fix slither action

--- don't change below this line ---
ENG-4305 Took 4 minutes

.github/workflows/slither.yml

@@ -11,14 +11,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
-      - name: Install Foundry
-        uses: foundry-rs/foundry-toolchain@v1
-      - name: Build the contracts
-        run: forge build --build-info
         with:
-          target: "foundry/"
+          ref: ${{ github.event.pull_request.head.sha }}
+          submodules: recursive
       - uses: crytic/slither-action@f197989dea5b53e986d0f88c60a034ddd77ec9a8
         with:
-          target: "foundry/"
-          ignore-compile: true
-          slither-args: "--filter-paths foundry/lib/"
+          target: 'foundry/'
+          slither-args: '--filter-paths foundry/lib/'