Build(deps-dev): Update lxml requirement from >=5.3.0 to >=6.1.3 - #3

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@11d5960a326750d5838078e36cf38b85af677262, actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065, github/codeql-action/upload-sarif@4bfa242aa49c5f7c6770b98670d354a7dfac05f8. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/