feat: preserve native dtype for SCHISM outputs - #12

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@v5, peaceiris/actions-gh-pages@v3.9.2. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Unexpected input(s) 'path', valid inputs are ['owner', 'repository', 'access-token', 'depth', 'branch', 'submodule']