Bump waitress from 2.1.1 to 2.1.2

Bumps [waitress](https://github.com/Pylons/waitress) from 2.1.1 to 2.1.2.
- [Release notes](https://github.com/Pylons/waitress/releases)
- [Changelog](https://github.com/Pylons/waitress/blob/v2.1.2/CHANGES.txt)
- [Commits](Pylons/waitress@v2.1.1...v2.1.2)

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

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

Author: dependabot[bot]

requirements.txt

@@ -68,6 +68,6 @@ tqdm==4.48.0
 typed-ast==1.4.1
 typing-extensions==3.7.4.2
 urllib3==1.26.5
-waitress==2.1.1
+waitress==2.1.2
 websocket-client==0.57.0
 Werkzeug==1.0.1