deps: add test for v8 bug in toUpper('ç')

* add test for ç/Ç in various locales

PR-URL: https://github.com/nodejs/node/pull/9828
Fixes: https://github.com/nodejs/node/issues/9785


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>
Reviewed-By: Myles Borins <myles.borins@gmail.com>