Migrate to trusted publishing

Signed-off-by: Stephen Finucane <stephen@that.guru>

Author: stephenfin

.github/workflows/ci.yaml

@@ -66,6 +66,11 @@ jobs:
     runs-on: ubuntu-latest
     needs: test
     if: github.event_name == 'push'
+    environment:
+      name: pypi
+      url: https://pypi.org/p/sphinx-click
+    permissions:
+      id-token: write
     steps:
       - name: Checkout source code
         uses: actions/checkout@v5
@@ -83,5 +88,3 @@ jobs:
       - name: Publish distribution to PyPI
         if: startsWith(github.ref, 'refs/tags')
         uses: pypa/gh-action-pypi-publish@release/v1
-        with:
-          password: ${{ secrets.PYPI_API_TOKEN }}