Bump core-js-pure from 3.49.0 to 3.50.0 - #1261

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: fastify/github-action-merge-dependabot@v3.0.0. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/