Bump webob from 1.8.6 to 1.8.7

Bumps [webob](https://github.com/Pylons/webob) from 1.8.6 to 1.8.7.
- [Release notes](https://github.com/Pylons/webob/releases)
- [Changelog](https://github.com/Pylons/webob/blob/1.8.7/CHANGES.txt)
- [Commits](Pylons/webob@1.8.6...1.8.7)

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

requirements.txt

@@ -33,6 +33,6 @@ ujson==4.0.2
 urllib3==1.26.3
 venusian==3.0.0
 waitress==1.4.4
-WebOb==1.8.6
+WebOb==1.8.7
 zope.deprecation==4.4.0
 zope.interface==5.2.0