Switch CI trigger from pull_request_target to pull_request - #259

Error: failed to remove labels: safe to test

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions-ecosystem/action-remove-labels@v1.3.0, prince-chrismc/check-actor-permissions-action@v3. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/