Bump webtest from 2.0.29 to 2.0.30 in /{{cookiecutter.app_name}}

Bumps [webtest](https://github.com/Pylons/webtest) from 2.0.29 to 2.0.30.
- [Release notes](https://github.com/Pylons/webtest/releases)
- [Commits](https://github.com/Pylons/webtest/compare/2.0.29...2.0.30

)

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