checkout submodules, removed NumPy-related part

.github/workflows/nanobind.yml

@@ -53,6 +53,7 @@ jobs:
     - uses: actions/checkout@v3
       with:
         repository: wjakob/nanobind
+        submodules: recursive
 
     - name: Setup Python ${{ matrix.python }}
       uses: actions/setup-python@v4
@@ -62,17 +63,6 @@ jobs:
     - name: Update CMake
       uses: jwlawson/[email protected]
 
-    - name: Cache wheels
-      if: runner.os == 'macOS'
-      uses: actions/cache@v3
-      with:
-        # This path is specific to macOS - we really only need it for PyPy NumPy wheels
-        # See https://github.com/actions/cache/blob/master/examples.md#python---pip
-        # for ways to do this more generally
-        path: ~/Library/Caches/pip
-        # Look to see if there is a cache hit for the corresponding requirements file
-        key: ${{ runner.os }}-pip-${{ matrix.python }}-x64-${{ hashFiles('tests/requirements.txt') }}
-
     - name: Setup annotations on Linux
       if: runner.os == 'Linux'
       run: python -m pip install pytest-github-actions-annotate-failures