Bump webob from 1.8.5 to 1.8.8

Bumps [webob](https://github.com/Pylons/webob) from 1.8.5 to 1.8.8.
- [Changelog](https://github.com/Pylons/webob/blob/main/CHANGES.txt)
- [Commits](Pylons/webob@1.8.5...1.8.8)

---
updated-dependencies:
- dependency-name: webob
  dependency-type: direct:development
...

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

requirements.dev.txt

@@ -34,7 +34,7 @@ tox==3.23.0
 typing==3.7.4.3             # via sphinx
 virtualenv==20.4.2        # via tox
 waitress==1.4.3           # via webtest
-webob==1.8.5              # via webtest
+webob==1.8.8              # via webtest
 webtest==2.0.33           # via flask-webtest
 xvfbwrapper==0.2.9
 --editable .