[SPIR-V] Add SPV_EXT_descriptor_heap + SPV_KHR_untyped_pointers codegen - #8517

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683, actions/setup-python@v4, step-security/changed-files@3dbe17c78367e7d60f00d78ae6781a35be47b4a1. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/