Bump waitress from 1.1.0 to 1.4.1

Bumps [waitress](https://github.com/Pylons/waitress) from 1.1.0 to 1.4.1.
- [Release notes](https://github.com/Pylons/waitress/releases)
- [Changelog](https://github.com/Pylons/waitress/blob/master/CHANGES.txt)
- [Commits](Pylons/waitress@v1.1.0...v1.4.1)

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

requirements-dev.txt

@@ -6,7 +6,7 @@ Sphinx==1.7.8
 sphinxcontrib-httpdomain==1.7.0
 sphinxcontrib-plantuml==0.12
 
-waitress==1.1.0
+waitress==1.4.1
 pyramid_debugtoolbar==4.4
 
 #testing