Update jscpd config schema - #5909

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: OSS-Docs-Tools/code-owner-self-merge@7e8e6e5b31e090570eed0c372e57575cbf0ce962. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/