Make the type of the sprites column in pokemon_v2_pokemonsprites jsonb

This is so Hasura automatically transforms the field into an array
instead of a JSON encoded in a string.

Migration was generated by the `makemigrations` command.

pokemon_v2/migrations/0014_auto_20231119_0303.py

@@ -0,0 +1,19 @@
+# Generated by Django 2.1.15 on 2023-11-19 03:03
+
+import django.contrib.postgres.fields.jsonb
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pokemon_v2', '0013_pokemonabilitypast'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='pokemonsprites',
+            name='sprites',
+            field=django.contrib.postgres.fields.jsonb.JSONField(),
+        ),
+    ]

pokemon_v2/models.py

@@ -1,4 +1,5 @@
 from django.db import models
+from django.contrib.postgres.fields import JSONField
 
 #####################
 #  ABSTRACT MODELS  #
@@ -1795,4 +1796,4 @@ class PokemonTypePast(HasPokemon, HasType, HasGeneration):
 
 
 class PokemonSprites(HasPokemon):
-    sprites = models.CharField(max_length=20000)
+    sprites = JSONField()