fix(cohorts): reorder last_synced_at migration after mixpanel source

Author: Zaimwa9

…migrations/0004_cohort_last_synced_at.py …migrations/0005_cohort_last_synced_at.pyapi/cohorts/migrations/0004_cohort_last_synced_at.py renamed to api/cohorts/migrations/0005_cohort_last_synced_at.py api/cohorts/migrations/0004_cohort_last_synced_at.py renamed to api/cohorts/migrations/0005_cohort_last_synced_at.py

@@ -3,7 +3,7 @@
 
 class Migration(migrations.Migration):
     dependencies = [
-        ("cohorts", "0003_cohort_sync_key"),
+        ("cohorts", "0004_mixpanel_source"),
     ]
 
     operations = [