Bump webob from 1.8.5 to 1.8.6

Bumps [webob](https://github.com/Pylons/webob) from 1.8.5 to 1.8.6.
- [Release notes](https://github.com/Pylons/webob/releases)
- [Changelog](https://github.com/Pylons/webob/blob/master/CHANGES.txt)
- [Commits](https://github.com/Pylons/webob/commits)

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

requirements.txt

@@ -38,6 +38,6 @@ ujson==1.35
 urllib3==1.25.7
 venusian==3.0.0
 waitress==1.4.2
-WebOb==1.8.5
+WebOb==1.8.6
 zope.deprecation==4.4.0
 zope.interface==4.7.1