Add support for BIG SOLIDUS unicode characters for off topic names

We must add support for all B I G S O L I D U S. This is necessary.

Author: minalike

pydis_site/apps/api/migrations/0082_otn_allow_big_solidus.py

@@ -0,0 +1,19 @@
+# Generated by Django 3.1.14 on 2022-04-21 23:29
+
+import django.core.validators
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('api', '0081_bumpedthread'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='offtopicchannelname',
+            name='name',
+            field=models.CharField(help_text='The actual channel name that will be used on our Discord server.', max_length=96, primary_key=True, serialize=False, validators=[django.core.validators.RegexValidator(regex="^[a-z0-9\\U0001d5a0-\\U0001d5b9-ǃ？’'＜＞⧹⧸]+$")]),
+        ),
+    ]

pydis_site/apps/api/models/bot/off_topic_channel_name.py

@@ -11,7 +11,7 @@ class OffTopicChannelName(ModelReprMixin, models.Model):
         primary_key=True,
         max_length=96,
         validators=(
-            RegexValidator(regex=r"^[a-z0-9\U0001d5a0-\U0001d5b9-ǃ？’'＜＞]+$"),
+            RegexValidator(regex=r"^[a-z0-9\U0001d5a0-\U0001d5b9-ǃ？’'＜＞⧹⧸]+$"),
         ),
         help_text="The actual channel name that will be used on our Discord server."
     )