Bump dompurify and monaco-editor-core in /monaco-lsp-client (#5166)

Bumps [dompurify](https://github.com/cure53/DOMPurify) and [monaco-editor-core](https://github.com/microsoft/vscode). These dependencies needed to be updated together.

Updates `dompurify` from 3.1.7 to 3.2.7
- [Release notes](https://github.com/cure53/DOMPurify/releases)
- [Commits](https://github.com/cure53/DOMPurify/compare/3.1.7...3.2.7)

Updates `monaco-editor-core` from 0.54.0 to 0.55.1
- [Release notes](https://github.com/microsoft/vscode/releases)
- [Commits](https://github.com/microsoft/vscode/commits)

---
updated-dependencies:
- dependency-name: dompurify
  dependency-version: 3.2.7
  dependency-type: indirect
- dependency-name: monaco-editor-core
  dependency-version: 0.55.1
  dependency-type: indirect
...

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