chore(deps): bump keras from 3.13.2 to 3.15.0 in the pip group across 1 directory - #37

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v2. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/