Bump waitress from 2.0.0 to 2.1.1

Bumps [waitress](https://github.com/Pylons/waitress) from 2.0.0 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/v2.0.0...v2.1.1)

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

Signed-off-by: dependabot[bot] <support@github.com>

requirements.txt

@@ -32,5 +32,5 @@ tornado==6.1
 tweepy==3.10.0
 tzlocal==2.1
 urllib3==1.26.5
-waitress==2.0.0
+waitress==2.1.1
 Werkzeug==2.0.1