Bump waitress from 2.0.0 to 2.1.0

Bumps [waitress](https://github.com/Pylons/waitress) from 2.0.0 to 2.1.0.
- [Release notes](https://github.com/Pylons/waitress/releases)
- [Changelog](https://github.com/Pylons/waitress/blob/master/CHANGES.txt)
- [Commits](Pylons/waitress@v2.0.0...v2.1.0)

---
updated-dependencies:
- dependency-name: waitress
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements.txt

@@ -20,7 +20,7 @@ markupsafe==2.0.0
     # via jinja2
 psycopg2==2.9.3
     # via -r requirements.in
-waitress==2.0.0
+waitress==2.1.0
     # via -r requirements.in
 werkzeug==2.0.0
     # via flask