Hotfix: Avoid infinite loop in migration at all cost

src/pretix/__init__.py

@@ -1 +1 @@
-__version__ = "3.17.0"
+__version__ = "3.17.1"

src/pretix/base/migrations/0179_auto_20210311_1653.py

@@ -4,7 +4,7 @@ from django.db import migrations
 
 
 def clean_duplicates(apps, schema_editor):
-    while True:
+    for i in range(100):  # no infinite loops
         # Double subquery to avoid MySQL error 1093
         delete_options = """
             DELETE