Fix slow shader file watch on Windows - #576

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: hendrikmuhs/ccache-action@v1.2, mymindstorm/setup-emsdk@v14. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

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No cached files found at path "/home/runner/work/cute_framework/cute_framework/emsdk-cache" - downloading and caching emsdk.