Bump waitress from 1.4.3 to 2.1.1

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](Pylons/waitress@v1.4.3...v2.1.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements.txt

@@ -63,7 +63,7 @@ talons==0.3
 tinydb==3.13.0
 urllib3==1.26.5
 visitor==0.1.3
-waitress==1.4.3
+waitress==2.1.1
 websockets==9.1
 Werkzeug==0.15.3
 wordpress-api==1.2.7