chore(deps): drop unused direct memmap2 dependency - #867

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, github/codeql-action/analyze@ce64ddcb0d8d890d2df4a9d1c04ff297367dea2a, github/codeql-action/autobuild@ce64ddcb0d8d890d2df4a9d1c04ff297367dea2a, github/codeql-action/init@ce64ddcb0d8d890d2df4a9d1c04ff297367dea2a. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/