ci: Use PyPI Trusted Publisher for publishing package (#294)

* Use the OpenID Connect (OIDC) standard to publish to PyPI and TestPyPI
  using PyPI's "Trusted Publisher" implementation to publish without
  using API tokens stored as GitHub Actions secrets. Use an optional
  GitHub Actions environment to further restrict publishing to selected
  branches for additional security.
   - c.f. https://blog.pypi.org/posts/2023-04-20-introducing-trusted-publishers/
   - c.f. https://docs.pypi.org/trusted-publishers/

.github/workflows/wheels.yml

@@ -97,6 +97,13 @@ jobs:
   upload_all:
     needs: [build_wheels, make_sdist]
     runs-on: ubuntu-latest
+    # Restrict to the environment set for the trusted publisher
+    environment:
+      name: publish
+    # Mandatory for publishing with a trusted publisher
+    # c.f. https://docs.pypi.org/trusted-publishers/using-a-publisher/
+    permissions:
+      id-token: write
     if: github.event_name == 'release' && github.event.action == 'published'
 
     steps:
@@ -108,6 +115,4 @@ jobs:
 
       - uses: pypa/gh-action-pypi-publish@release/v1
         with:
-          user: __token__
-          # Remember to generate this and set it in "GitHub Secrets"
-          password: ${{ secrets.pypi_password }}
+          print-hash: true