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](Pylons/waitress@v2.0.0...v2.1.1)

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

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

Author: dependabot[bot]

setup.py

@@ -14,7 +14,7 @@
     'pyramid_chameleon==0.3',
     'pyramid_jinja2==2.8',
     'pyramid_debugtoolbar==4.9',
-    'waitress==2.0.0',
+    'waitress==2.1.1',
     'secureconfig==0.2.0a0',
     'WTForms==2.3.3',
     'reconfigure==0.1.82'