Update watchOS minimum version to 5 - #363

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/setup-python@42375524e23c412d93fb67b49958b491fce71c38, tj-actions/changed-files@2f7c5bfce28377bc069a65ba478de0a74aa0ca32. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/