update dependency for shakespeare

According to the Hackage document for [hamlet](https://hackage.haskell.org/package/hamlet):

> Deprecated in favor of shakespeare

And yesod-bin's hsfiles is no longer using `hamlet`, `shakespeare-css`, `shakespeare-js` and `shakespeare-text` explicitly.

see: https://github.com/yesodweb/yesod/blob/master/yesod-bin/hsfiles/sqlite.hsfiles#L427