Remove maturin pypi token (#32344)

Planning to use
https://www.maturin.rs/distribution#using-pypis-trusted-publishing

GitOrigin-RevId: 04d86b928c4f91d3f3dc047af9da41fedc92214b

Author: nipunn1313

.github/workflows/python-client-build.yml

@@ -228,8 +228,6 @@ jobs:
       - name: Publish to PyPI
         if: ${{ startsWith(github.ref, 'refs/tags/convex-py/') }}
         uses: PyO3/maturin-action@v1
-        env:
-          MATURIN_PYPI_TOKEN: ${{ secrets.PYPI_API_TOKEN }}
         with:
           command: upload
           args: --non-interactive --skip-existing wheels-*/*