[release-1.9] chore(deps): prune and refresh TechDocs Python requirements - #5454

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/cache@v4, actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5, actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020, dtinth/setup-github-actions-caching-for-turbo@cc723b4600e40a6b8815b65701d8614b91e2669e. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/