need to find strings in ulab

.github/workflows/pre-commit.yml

@@ -17,6 +17,8 @@ jobs:
     - uses: actions/setup-python@v1
     - name: Install deps
       run: sudo apt-get update && sudo apt-get install -y gettext
+    - name: Populate selected submodules
+      run: git submodule update --init extmod/ulab
     - name: set PY
       run: echo >>$GITHUB_ENV PY="$(python -c 'import hashlib, sys;print(hashlib.sha256(sys.version.encode()+sys.executable.encode()).hexdigest())')"
     - uses: actions/cache@v1