Add id-token: write permission to release pipeline

Author: RobbeSneyders

.github/workflows/release.yml

@@ -10,6 +10,8 @@ jobs:
   build-n-publish:
     name: Build and publish Python 🐍 distributions 📦 to PyPI and TestPyPI
     runs-on: ubuntu-latest
+    permissions:
+      id-token: write
     steps:
     - uses: actions/checkout@master