chore(deps): bump gettext from 0.16.1 to 0.17.0

Bumps [gettext](https://github.com/elixir-lang/gettext) from 0.16.1 to 0.17.0.
- [Release notes](https://github.com/elixir-lang/gettext/releases)
- [Changelog](https://github.com/elixir-lang/gettext/blob/master/CHANGELOG.md)
- [Commits](https://github.com/elixir-lang/gettext/commits)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

mix.exs

@@ -57,7 +57,7 @@ defmodule GroupherServer.Mixfile do
       {:ecto_sql, "~> 3.1.2"},
       {:phoenix_ecto, "~> 4.0"},
       {:postgrex, ">= 0.14.1"},
-      {:gettext, "~> 0.16.1"},
+      {:gettext, "~> 0.17.0"},
       {:plug_cowboy, "~> 2.0"},
       {:plug, "~> 1.8.0"},
       # GraphQl tool