Update to Erlang 28.4.3 and code cleanup. (#303)

Author: conradwt

.tool-versions

@@ -1,2 +1,2 @@
 elixir 1.19.5-otp-28
-erlang 28.4.2
+erlang 28.4.3

Dockerfile

@@ -14,8 +14,8 @@
 #   - Ex: hexpm/elixir:1.15.4-erlang-26.0.2-debian-bullseye-20230612-slim
 #
 ARG ELIXIR_VERSION=1.19.5
-ARG OTP_VERSION=28.4.2
-ARG DEBIAN_VERSION=bullseye-20260406-slim
+ARG OTP_VERSION=28.4.3
+ARG DEBIAN_VERSION=bullseye-20260421-slim
 
 ARG BUILDER_IMAGE="hexpm/elixir:${ELIXIR_VERSION}-erlang-${OTP_VERSION}-debian-${DEBIAN_VERSION}"
 ARG RUNNER_IMAGE="debian:${DEBIAN_VERSION}"

mix.exs

@@ -9,10 +9,7 @@ defmodule ZeroPhoenix.Mixfile do
       elixirc_paths: elixirc_paths(Mix.env()),
       start_permanent: Mix.env() == :prod,
       aliases: aliases(),
-      deps: deps(),
-      preferred_cli_env: [
-        "test.watch": :test
-      ]
+      deps: deps()
     ]
   end
 
@@ -51,8 +48,8 @@ defmodule ZeroPhoenix.Mixfile do
       {:absinthe, "~> 1.7.10"},
       {:absinthe_plug, "~> 1.5.9"},
       {:cors_plug, "~> 3.0.3"},
-      {:credo, "~> 1.7.18", only: [:dev, :test], runtime: false},
-      {:ecto_psql_extras, "~> 0.7.15"}
+      {:ecto_psql_extras, "~> 0.7.15"},
+      {:credo, "~> 1.7.18", only: [:dev, :test], runtime: false}
     ]
   end