chore: update dependencies and remove Appsignal (#147)

Author: zorn

.tool-versions

@@ -1,2 +1,2 @@
-erlang 27.3.3
-elixir 1.18.3-otp-27
+erlang 28.0.1
+elixir 1.18.4-otp-28

lib/flick/application.ex

@@ -8,8 +8,6 @@ defmodule Flick.Application do
 
   @impl Application
   def start(_type, _args) do
-    Appsignal.Phoenix.LiveView.attach()
-
     children = [
       FlickWeb.Telemetry,
       Flick.Repo,

mix.exs

@@ -45,9 +45,6 @@ defmodule Flick.MixProject do
       {:dialyxir, "~> 1.4", only: [:dev, :test], runtime: false},
       {:credo, "~> 1.7", only: [:dev, :test], runtime: false},
 
-      # For Observability.
-      {:appsignal_phoenix, "~> 2.5"},
-
       # To Render Markdown.
       {:earmark, "~> 1.4"},