security(deps): update lxml requirement from >=4.9.0 to >=6.1.1 (#674)

Updates the requirements on [lxml](https://github.com/lxml/lxml) to permit the latest version.
- [Release notes](https://github.com/lxml/lxml/releases)
- [Changelog](https://github.com/lxml/lxml/blob/master/CHANGES.txt)
- [Commits](https://github.com/lxml/lxml/compare/lxml-4.9.0...lxml-6.1.1)

---
updated-dependencies:
- dependency-name: lxml
  dependency-version: 6.1.1
  dependency-type: direct:production
...

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pyproject.toml

@@ -65,7 +65,7 @@ dependencies = [
   "protobuf>=5.29.1,<7.0",
   "grpcio>=1.71.2",
   "beautifulsoup4>=4.15.0",
-  "lxml>=4.9.0",
+  "lxml>=6.1.1",
   "pypdf2>=2.10.0",
   "python-docx>=1.2.0",
   "openpyxl>=3.1.5",