Bump actions/add-to-project from 0.5.0 to 0.6.0

Bumps [actions/add-to-project](https://github.com/actions/add-to-project) from 0.5.0 to 0.6.0.
- [Release notes](https://github.com/actions/add-to-project/releases)
- [Commits](actions/add-to-project@v0.5.0...v0.6.0)

---
updated-dependencies:
- dependency-name: actions/add-to-project
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/add-to-project.yml

@@ -18,7 +18,7 @@ jobs:
           app_id: ${{ secrets.SYNC_APP_ID }}
           private_key: ${{ secrets.SYNC_APP_PRIVATE_KEY }}
 
-      - uses: actions/add-to-project@v0.5.0
+      - uses: actions/add-to-project@v0.6.0
         with:
           project-url: ${{ secrets.ADD_TO_PROJECT_URL }}
           github-token: ${{ steps.generate-token.outputs.token }}