Bump waitress from 1.4.4 to 2.1.1 in /deploy

Bumps [waitress](https://github.com/Pylons/waitress) from 1.4.4 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/v1.4.4...v2.1.1)

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

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

deploy/requirements.txt

@@ -80,7 +80,7 @@ spiffworkflow
 sqlalchemy==1.3.20
 swagger-ui-bundle==0.0.8
 urllib3==1.26.5
-waitress==1.4.4
+waitress==2.1.1
 webob==1.8.6
 webtest==2.0.35
 werkzeug==1.0.1