Switch from `:uuid` to `:elixir_uuid`

[binarylogic]

Apparently the :uuid library has changed it's name to :elixir_uuid. This causes a conflict error when building our app since sentry requires the old name:

==> Release failed, during .boot generation:
        Duplicated modules: 
    	'Elixir.UUID' specified in elixir_uuid and uuid

We've switched to using the legacy :uuid dependency for now, but wanted to make you aware.