chore(deps): update dependency phoenix_html to v4

Author: renovate[bot]

mix.exs

@@ -34,7 +34,7 @@ defmodule Eblog.Mixfile do
      {:phoenix_pubsub, "== 1.1.2"},
      {:phoenix_ecto, "== 3.6.0"},
      {:postgrex, "== 0.16.5"},
-     {:phoenix_html, "== 2.14.3"},
+     {:phoenix_html, "== 4.1.0"},
      {:phoenix_live_reload, "== 1.3.3", only: :dev},
      {:gettext, "== 0.19.1"},
      {:cowboy, "== 1.1.2"}]