ci(action): update actions/add-to-project action to v0.6.0 (#680)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/add_to_octokit_project.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     continue-on-error: true
     steps:
-      - uses: actions/add-to-project@v0.5.0
+      - uses: actions/add-to-project@v0.6.0
         with:
           project-url: https://github.com/orgs/octokit/projects/10
           github-token: ${{ secrets.OCTOKITBOT_PROJECT_ACTION_TOKEN }}