chore(deps): update dependency phoenix to ~> 1.8.0 (#167)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [phoenix](https://hex.pm/packages/phoenix) ([source](https://github.com/phoenixframework/phoenix)) | prod | minor | `~> 1.7.0` -> `~> 1.8.0` |

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Co-authored-by: Joao P Dubas <joao.dubas+gitea@gmail.com>
Reviewed-on: #167
Co-authored-by: renovate-bot <renovate-bot@dubas.dev>
Co-committed-by: renovate-bot <renovate-bot@dubas.dev>

lib/wabanex_web.ex

@@ -20,7 +20,7 @@ defmodule WabanexWeb do
   def controller do
     quote do
       use Gettext, backend: WabanexWeb.Gettext
-      use Phoenix.Controller, namespace: WabanexWeb
+      use Phoenix.Controller, formats: [:json]
 
       import Plug.Conn
       alias WabanexWeb.Router.Helpers, as: Routes