fix: keep every netmask of an @ipMatch prefix in the radix tree (2.x) - #3671

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: msys2/setup-msys2@fb197b72ce45fb24f17bf3f807a388985654d1f2. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/