Update authentication in publish workflow to 'trusted publisher'

Signed-off-by: Håkon Wiik Ånes <hwaanes@gmail.com>

.github/workflows/publish.yml

@@ -20,6 +20,9 @@ on:
 jobs:
   upload:
     runs-on: ubuntu-latest
+    permissions:
+      # IMPORTANT: this permission is mandatory for trusted publishing
+      id-token: write
     steps:
     - uses: actions/checkout@v3
 
@@ -47,6 +50,3 @@ jobs:
 
     - name: Publish package to PyPI
       uses: pypa/gh-action-pypi-publish@release/v1
-      with:
-        user: __token__
-        password: ${{ secrets.PYPI_API_TOKEN }}