fuzz: forbid usage of pcre with \X backport7 - #15689

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871, actions/upload-artifact@b4b15b8c7c6ac21ea08fcf65892d2ee8f75cf882. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/