Minor bugfix release

What's Changed

• Docs update for dicttoxml by @Jeroendevr in #140
• chore(deps): bump waitress from 2.1.1 to 2.1.2 in /docs by @dependabot in #141
• feat: bump python 3.10 and 3.11 version by @vinitkumar in #142
• escape xml char when having attrs by @Jeroendevr in #144

Full Changelog: 3.19.0...3.19.2