Where possible, use built-in JSON instead of Jason

Note that it's not possible to replace any call where we encode and
pretty print, as JSON doesn't have such functionality.

lib/last_fm/api_impl.ex

@@ -133,7 +133,7 @@ defmodule LastFm.APIImpl do
 
     case Finch.request(req, LastFm.Finch, @request_opts) do
       {:ok, response} when response.status == 200 ->
-        Jason.decode(response.body)
+        JSON.decode(response.body)
         |> identify_body()
 
       other ->

lib/mix/tasks/music_brainz/refresh_fixtures.ex

@@ -33,7 +33,7 @@ defmodule Mix.Tasks.MusicBrainz.RefreshFixtures do
         {:ok, body} ->
           # store the fixture pretty printed
           dest = Path.join(@fixtures_folder, filename)
-          content = body |> Jason.decode!() |> Jason.encode!(pretty: true)
+          content = body |> JSON.decode!() |> Jason.encode!(pretty: true)
           File.write!(dest, content)
 
         {:error, msg} ->

lib/music_brainz/api_impl.ex

@@ -439,7 +439,7 @@ defmodule MusicBrainz.APIImpl do
 
     case Finch.request(req, MusicBrainz.Finch) do
       {:ok, response} when response.status == 200 ->
-        {:ok, Jason.decode!(response.body)}
+        {:ok, JSON.decode!(response.body)}
 
       {:ok, response} when response.status in 301..308 ->
         location = :proplists.get_value("location", response.headers)

lib/open_ai.ex

@@ -11,7 +11,7 @@ defmodule OpenAI do
       end
     end)
 
-    result = Agent.get(collector, & &1) |> Jason.decode!()
+    result = Agent.get(collector, & &1) |> JSON.decode!()
     Agent.stop(collector)
     {:ok, result}
   end

lib/open_ai/api.ex

@@ -64,7 +64,7 @@ defmodule OpenAI.API do
 
   defp decode_body("", _), do: :ok
   defp decode_body("[DONE]", _), do: :ok
-  defp decode_body(json, cb), do: cb.(Jason.decode!(json))
+  defp decode_body(json, cb), do: cb.(JSON.decode!(json))
 
   defp api_key do
     Application.get_env(:music_library, OpenAI)

test/last_fm/artist_test.exs

@@ -8,7 +8,7 @@ defmodule LastFm.ArtistTest do
       api_response =
         @api_response_path
         |> File.read!()
-        |> Jason.decode!()
+        |> JSON.decode!()
         |> Map.get("artist")
 
       assert %LastFm.Artist{

test/last_fm/track_test.exs

@@ -8,7 +8,7 @@ defmodule LastFm.TrackTest do
       api_response =
         @api_response_path
         |> File.read!()
-        |> Jason.decode!()
+        |> JSON.decode!()
         |> get_in(["recenttracks", "track"])
 
       assert [

test/support/fixtures/last_fm_fixtures.ex

@@ -4,6 +4,6 @@ defmodule LastFm.Fixtures do
   def artist_get_info do
     Path.join([@fixtures_folder, "artist.getinfo.json"])
     |> File.read!()
-    |> Jason.decode!()
+    |> JSON.decode!()
   end
 end

test/support/fixtures/release_groups_fixtures.ex

@@ -23,13 +23,13 @@ defmodule MusicLibrary.ReleaseGroupsFixtures do
   def release_group(:mystery_of_time) do
     Path.join([@fixtures_folder, "release_group - avantasia - the mystery of time.json"])
     |> File.read!()
-    |> Jason.decode!()
+    |> JSON.decode!()
   end
 
   def release_group(:marbles) do
     Path.join([@fixtures_folder, "release_group - marillion - marbles.json"])
     |> File.read!()
-    |> Jason.decode!()
+    |> JSON.decode!()
   end
 
   def release_group(:lockdown_trilogy) do
@@ -38,19 +38,19 @@ defmodule MusicLibrary.ReleaseGroupsFixtures do
       "release_group_with_includes - mariusz duda - lockdown trilogy.json"
     ])
     |> File.read!()
-    |> Jason.decode!()
+    |> JSON.decode!()
   end
 
   def release(:mystery_of_time) do
     Path.join([@fixtures_folder, "release - avantasia - the mystery of time.json"])
     |> File.read!()
-    |> Jason.decode!()
+    |> JSON.decode!()
   end
 
   def release(:marbles) do
     Path.join([@fixtures_folder, "release - marillion - marbles.json"])
     |> File.read!()
-    |> Jason.decode!()
+    |> JSON.decode!()
   end
 
   def release_group_id(name) do