Add write permissions for trusted publishing

Author: cmalinmayor

.github/workflows/deploy.yml

@@ -9,6 +9,8 @@ jobs:
   build-n-publish:
     name: Build and publish Python 🐍 distributions 📦 to PyPI
     runs-on: ubuntu-latest
+    permissions:
+      id-token: write  # for trusted publishing
     if: contains(github.ref, 'tags')
     steps:
       - uses: actions/checkout@v4