Replace outdated dependencies, with gskinner updated one's, and overrides intl dependency.

[bienvenuelisis]

In the last Flutter release, intl version 0.19.0 is pinned, so the easiest solution to continue to use the 0.18.1 version for this repo, is to override it's dependency.

And drop_cap_text, home_widget dependencies are outdated, so it can be replaced with gskinner one's.