Bump webob from 1.6.3 to 1.8.8

Bumps [webob](https://github.com/Pylons/webob) from 1.6.3 to 1.8.8.
- [Changelog](https://github.com/Pylons/webob/blob/main/CHANGES.txt)
- [Commits](Pylons/webob@1.6.3...1.8.8)

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

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

requirements.txt

@@ -6,7 +6,7 @@ PasteDeploy==1.5.2
 Pygments==2.1.3
 SQLAlchemy==1.2.19
 WebHelpers==1.3
-WebOb==1.6.3
+WebOb==1.8.8
 py==1.11.0
 pyramid==1.7.3
 pyramid-chameleon==0.3