Update dependencies (#40)

* Update dependencies

Oban update requires no migrations, other updates also seem
unproblematic.

* Loosen Dockerfile Elixir version again

The issue with OTP/gen_smtp seems to have been fixed

mix.exs

@@ -52,7 +52,7 @@ defmodule Keila.MixProject do
       {:ecto_sql, "~> 3.4"},
       {:postgrex, ">= 0.0.0"},
       {:phoenix_live_view, "~> 0.15"},
-      {:floki, "~> 0.29.0"},
+      {:floki, "~> 0.30.0"},
       {:phoenix_html, "~> 2.11"},
       {:phoenix_live_reload, "~> 1.2", only: :dev},
       {:phoenix_live_dashboard, "~> 0.4"},
@@ -62,16 +62,15 @@ defmodule Keila.MixProject do
       {:jason, "~> 1.0"},
       {:plug_cowboy, "~> 2.0"},
       {:ex_doc, "~> 0.23", only: :dev, runtime: false},
-      {:swoosh, "~> 1.0"},
-      # Unpatched version of gen_smtp currently broken, see https://github.com/gen-smtp/gen_smtp/pull/227
-      {:gen_smtp, git: "https://github.com/pentacent/gen_smtp/", override: true},
+      {:swoosh, "~> 1.3"},
+      {:gen_smtp, "~> 1.1"},
       {:hackney, "~> 1.9"},
       {:hashids, "~> 2.0"},
       {:argon2_elixir, "~> 2.3"},
-      {:httpoison, "~> 1.7"},
+      {:httpoison, "~> 1.8"},
       {:nimble_csv, "~> 1.1"},
-      {:oban, "~> 2.4.3"},
-      {:solid, "~> 0.4.0"},
+      {:oban, "~> 2.5.0"},
+      {:solid, "~> 0.7.1"},
       {:earmark, "~> 1.4"},
       {:tzdata, "~> 1.1"}
     ]