chore(deps-dev): bump credo from 1.1.3 to 1.4.0

Bumps [credo](https://github.com/rrrene/credo) from 1.1.3 to 1.4.0.
- [Release notes](https://github.com/rrrene/credo/releases)
- [Changelog](https://github.com/rrrene/credo/blob/master/CHANGELOG.md)
- [Commits](rrrene/credo@v1.1.3...v1.4.0)

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

Author: dependabot-preview[bot]

mix.exs

@@ -87,7 +87,7 @@ defmodule GroupherServer.Mixfile do
       {:inch_ex, "~> 2.0", only: [:dev, :test]},
       {:short_maps, "~> 0.1.1"},
       {:jason, "~> 1.1.1"},
-      {:credo, "~> 1.1.0", only: [:dev, :test], runtime: false},
+      {:credo, "~> 1.4.0", only: [:dev, :test], runtime: false},
       {:dialyxir, "~> 1.0.0-rc.2", only: [:dev, :mock], runtime: false},
       {:excoveralls, "~> 0.8", only: :test},
       {:sentry, "~> 7.1"},