chore(backend): update dependency phoenix_live_dashboard to ~> 0.8.0

Author: plural-renovate[bot]

apps/email/mix.exs

@@ -71,7 +71,7 @@ defmodule Email.MixProject do
       {:phoenix, "~> 1.6.0"},
       {:phoenix_html, "~> 3.2.0"},
       {:phoenix_live_reload, "~> 1.2", only: :dev},
-      {:phoenix_live_dashboard, "~> 0.5.3"},
+      {:phoenix_live_dashboard, "~> 0.8.0"},
       {:telemetry_metrics, "~> 0.6.1"},
       {:telemetry_poller, "~> 1.0.0"},
       {:bamboo_phoenix, "~> 1.0"},