chore: fix release workflow (#6373)

## 📄 Description

Provenance must be set to `true` in order to publish on npm without a
token.

---

## 🔮 Design review

- [ ] Design review done
- [x] No design review needed

## 📝 Checklist

- ✅ My code follows the style guidelines of this project
- 🛠️ I have performed a self-review of my own code
- 📄 I have made corresponding changes to the documentation
- ⚠️ My changes generate no new warnings or errors
- 🧪 I have added tests that prove my fix is effective or that my feature
works
- ✔️ New and existing unit tests pass locally with my changes

Author: alizedebray

.github/workflows/release.yaml

@@ -51,6 +51,7 @@ jobs:
         uses: changesets/action@e0145edc7d9d8679003495b11f87bd8ef63c0cba
         env:
           GITHUB_TOKEN: ${{ secrets.SWISSPOSTDEVS_ACCESS_TOKEN }}
+          NPM_CONFIG_PROVENANCE: true
         with:
           title: 'chore(changesets): 🦋📦 publish packages (${{ github.ref_name }})'
           commit: 'chore(changesets): publish packages'