chore(deps): update dependency phoenix_live_dashboard to ~> 0.8

Author: renovate[bot]

mix.exs

@@ -37,7 +37,7 @@ defmodule PollApi.MixProject do
       {:phoenix_ecto, "~> 4.1"},
       {:ecto_sql, "~> 3.4"},
       {:postgrex, ">= 0.0.0"},
-      {:phoenix_live_dashboard, "~> 0.4"},
+      {:phoenix_live_dashboard, "~> 0.8"},
       {:telemetry_metrics, "~> 0.6"},
       {:telemetry_poller, "~> 0.4"},
       {:gettext, "~> 0.18"},