chore(deps): update dependency telemetry_metrics to ~> 0.6

mix.exs

@@ -45,7 +45,7 @@ defmodule Wabanex.MixProject do
       {:phoenix_live_dashboard, "~> 0.6"},
       {:plug_cowboy, "~> 2.0"},
       {:postgrex, ">= 0.0.0"},
-      {:telemetry_metrics, "~> 0.4"},
+      {:telemetry_metrics, "~> 0.6"},
       {:telemetry_poller, "~> 1.0"}
     ]
   end