Omit unnecessary steps

Author: valeros

.github/workflows/tests.yml

@@ -8,14 +8,14 @@ jobs:
       fail-fast: false
       matrix:
         os: [macos-latest]
-        python-version: [3.9, 3.10, 3.11]
+        python-version: ["3.9", "3.10", "3.11"]
         example:
           - "examples/espidf-hello-world"
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v2
-        with:
-          submodules: "recursive"
+      # - uses: actions/checkout@v2
+      #   with:
+      #     submodules: "recursive"
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v3
         with: