Add link to synthetic churn dataset on Hugging Face - #29

Code Scanning could not process the submitted SARIF file: CodeQL analyses from advanced configurations cannot be processed when the default setup is enabled

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