[pull] develop from mermaid-js:develop - #231

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-node@1d0ff469b7ec7b3cb9d8673fde0c81c44821de2a, pnpm/action-setup@a7487c7e89a18df4991f7f222e4898a00d66ddda, testomatio/check-tests@0ea638fcec1820cf2e7b9854fdbdd04128a55bd4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/