Recursive submodules for lintrunner-mypy (#14282)

As reported by @mergennachin --
https://github.com/pytorch/executorch/actions/runs/17684876466/job/50267377324

Author: swolchok

.github/workflows/lint.yml

@@ -35,7 +35,7 @@ jobs:
     with:
       runner: linux.2xlarge
       docker-image: ci-image:executorch-ubuntu-22.04-linter
-      submodules: true
+      submodules: 'recursive'
       fetch-depth: 0
       ref: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.sha || github.sha }}
       timeout: 90