Configure trusted publishing

No more manual creation of tokens. Hurrah!

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

.github/workflows/ci.yaml

@@ -65,6 +65,8 @@ jobs:
   release:
     name: Upload release artifacts
     runs-on: ubuntu-latest
+    permissions:
+      id-token: write
     needs: test
     if: github.event_name == 'push'
     steps:
@@ -84,5 +86,3 @@ jobs:
       - name: Publish distribution to PyPI
         if: startsWith(github.ref, 'refs/tags')
         uses: pypa/gh-action-pypi-publish@master
-        with:
-          password: ${{ secrets.PYPI_API_TOKEN }}