(TK-80) Update dependencies/use webrouting service

This PR does three things. First, it updates all the dependencies in the generated template to the latest versions. Second, it changes the template to use `clj-http-client` instead of `clj-http`. Third, it changes the template to use the webrouting service instead of the webserver service.
1.2.0 is out.  Would probably be good to use it here, if we can.