Bump waitress from 1.4.3 to 1.4.4

Bumps [waitress](https://github.com/Pylons/waitress) from 1.4.3 to 1.4.4.
- [Release notes](https://github.com/Pylons/waitress/releases)
- [Changelog](https://github.com/Pylons/waitress/blob/master/CHANGES.txt)
- [Commits](Pylons/waitress@v1.4.3...v1.4.4)

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

requirements.txt

@@ -32,7 +32,7 @@ translationstring==1.3
 ujson==2.0.3
 urllib3==1.25.9
 venusian==3.0.0
-waitress==1.4.3
+waitress==1.4.4
 WebOb==1.8.6
 zope.deprecation==4.4.0
 zope.interface==5.1.0