build(deps): bump webtest from 2.0.35 to 3.0.0

Bumps [webtest](https://github.com/Pylons/webtest) from 2.0.35 to 3.0.0.
- [Release notes](https://github.com/Pylons/webtest/releases)
- [Commits](Pylons/webtest@2.0.35...3.0.0)

---
updated-dependencies:
- dependency-name: webtest
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

tox-requirements.txt

@@ -2,7 +2,7 @@
 coverage==5.3.1
 cryptography==3.3.2
 pytest==7.0.1
-WebTest==2.0.35
+WebTest==3.0.0
 Flask
 tornado
 responses==0.12.1