Add target directory for Slither analysis

.github/workflows/slither.yml

@@ -13,6 +13,7 @@ jobs:
         uses: crytic/[email protected]
         id: slither
         with:
+          target: ./contracts
           node-version: '18'
           fail-on: 'medium' # Fail the action on medium severity issues
           slither-args: '--checklist --markdown-root ${{ github.server_url }}/${{ github.repository }}/blob/${{ github.sha }}/'