Build musllinux wheels for Python 3.9-3.11. Skip PyPy wheels on i686

NumPy 2.0 has musllinux wheels for Python 3.9-3.12 on PyPI.

Building NumPy 2.0 for PyPy on i686 fails with errors like:

```
../numpy/_core/src/npysort/quicksort.cpp:86:51: error: no matches converting function ‘QSort_AVX512_ICL’ to type ‘void (*)(using TF = using Type = std::conditional<true, short int, short int>::type*, intptr_t)’ {aka ‘void (*)(short int*, int)’}
```

.github/workflows/deploy.yaml

@@ -32,10 +32,11 @@ jobs:
         run: python -m cibuildwheel --output-dir dist
         env:
           CIBW_ARCHS: ${{ matrix.archs }}
-          # Skip building musllinux wheels for the Python versions for which the oldest
-          # supported numpy version doesn't have musllinux wheels on PyPI.
-          # Skip also building for PyPy 3.8, which is deprecated upstream.
-          CIBW_SKIP: "cp38-musllinux_* cp39-musllinux_* cp310-musllinux_* cp311-musllinux_* pp38-*"
+          # Skip building musllinux wheels for the CPython versions for which the
+          # numpy version we build against doesn't have musllinux wheels on PyPI.
+          # Skip building for PyPy 3.8, which is deprecated upstream.
+          # Skip building for PyPy on i686 since NumPy 2.0 fails to build on it.
+          CIBW_SKIP: "cp38-musllinux_* pp38-* pp*-manylinux_i686"
       - name: Check packages
         run: twine check dist/*
       - uses: actions/upload-artifact@v4