workflows: Fix release permissions

We need `contents` for creating a release.

Author: martinpitt

.github/workflows/release.yml

@@ -9,7 +9,10 @@ jobs:
     runs-on: ubuntu-22.04
     environment: release
     permissions:
+      # PyPI trusted publisher
       id-token: write
+      # create release
+      contents: write
     steps:
       - name: Clone repository
         uses: actions/checkout@v3