Bump waitress from 1.4.3 to 2.1.1 (#691)

Bumps [waitress](https://github.com/Pylons/waitress) from 1.4.3 to 2.1.1.
- [Release notes](https://github.com/Pylons/waitress/releases)
- [Changelog](https://github.com/Pylons/waitress/blob/master/CHANGES.txt)
- [Commits](https://github.com/Pylons/waitress/compare/v1.4.3...v2.1.1)

---
updated-dependencies:
- dependency-name: waitress
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -28,7 +28,7 @@ requests==2.25.1
 soupsieve==1.9.5
 stem==1.8.0
 urllib3==1.26.5
-waitress==1.4.3
+waitress==2.1.1
 wcwidth==0.1.9
 Werkzeug==0.16.0
 python-dotenv==0.16.0