[mypyc] Clear only subtype refs in tp_dealloc of built-in subtypes - #21872

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, gabrielfalcao/pyenv-action@v13. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/