Harden optional Stable Audio dependencies - #5

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5, actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020, astral-sh/setup-uv@e58605a9b6da7c637471fab8847a5e5a6b8df081. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/