Remove `Checkout submodules` in favor of `forge build`

`git submodule sync` and `git submodule update --init --recursive` should be subsumed by `forge build`, which is run when the execution script is triggered. Hence the removal of this step
Co-authored-by: Matt Solomon <matt@mattsolomon.dev>

.circleci/config.yml

@@ -1277,11 +1277,6 @@ jobs:
       - checkout
       - check-changed:
           patterns: contracts-bedrock/test/kontrol,contracts-bedrock/src/L1/OptimismPortal\.sol
-      - run:
-          name: Checkout submodules
-          command: |
-            git submodule sync
-            git submodule update --init --recursive
       - run:
           name: "Start Docker Container"
           command: |