Bump earmark from 1.3.6 to 1.4.0

Bumps [earmark](https://github.com/pragdave/earmark) from 1.3.6 to 1.4.0.
- [Release notes](https://github.com/pragdave/earmark/releases)
- [Changelog](https://github.com/pragdave/earmark/blob/master/RELEASE.md)
- [Commits](https://github.com/pragdave/earmark/compare/v1.3.6...v1.4.0)

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

mix.exs

@@ -87,7 +87,7 @@ defmodule Mobilizon.Mixfile do
       {:plug_cowboy, "~> 2.0"},
       {:atomex, "0.3.0"},
       {:cachex, "~> 3.1"},
-      {:earmark, "~> 1.3.1"},
+      {:earmark, "~> 1.4.0"},
       {:geohax, "~> 0.3.0"},
       {:mogrify, "~> 0.7.2"},
       {:premailex, "~> 0.3.0"},

mix.lock

@@ -25,7 +25,7 @@
   "db_connection": {:hex, :db_connection, "2.1.1", "a51e8a2ee54ef2ae6ec41a668c85787ed40cb8944928c191280fe34c15b76ae5", [:mix], [{:connection, "~> 1.0.2", [hex: :connection, repo: "hexpm", optional: false]}], "hexpm"},
   "decimal": {:hex, :decimal, "1.8.0", "ca462e0d885f09a1c5a342dbd7c1dcf27ea63548c65a65e67334f4b61803822e", [:mix], [], "hexpm"},
   "dialyxir": {:hex, :dialyxir, "1.0.0-rc.7", "6287f8f2cb45df8584317a4be1075b8c9b8a69de8eeb82b4d9e6c761cf2664cd", [:mix], [{:erlex, ">= 0.2.5", [hex: :erlex, repo: "hexpm", optional: false]}], "hexpm"},
-  "earmark": {:hex, :earmark, "1.3.6", "ce1d0675e10a5bb46b007549362bd3f5f08908843957687d8484fe7f37466b19", [:mix], [], "hexpm"},
+  "earmark": {:hex, :earmark, "1.4.0", "397e750b879df18198afc66505ca87ecf6a96645545585899f6185178433cc09", [:mix], [], "hexpm"},
   "ecto": {:hex, :ecto, "3.1.7", "fa21d06ef56cdc2fdaa62574e8c3ba34a2751d44ea34c30bc65f0728421043e5", [:mix], [{:decimal, "~> 1.6", [hex: :decimal, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}], "hexpm"},
   "ecto_autoslug_field": {:hex, :ecto_autoslug_field, "2.0.0", "c4caca7e5f42057e503672feb2e1a7a58ff4c343cd9a5a63050ebabcdebfdcb5", [:mix], [{:ecto, ">= 2.1.0", [hex: :ecto, repo: "hexpm", optional: false]}, {:slugger, ">= 0.2.0", [hex: :slugger, repo: "hexpm", optional: false]}], "hexpm"},
   "ecto_enum": {:hex, :ecto_enum, "1.3.2", "659f7251b6a201a236db9dceef0f713319f095a23ad1d8718efd7a3d3ef3e21b", [:mix], [{:ecto, ">= 2.0.0", [hex: :ecto, repo: "hexpm", optional: false]}, {:mariaex, ">= 0.0.0", [hex: :mariaex, repo: "hexpm", optional: true]}, {:postgrex, ">= 0.0.0", [hex: :postgrex, repo: "hexpm", optional: true]}], "hexpm"},