Deletions: change User.purge/1 to defp, add CHANGELOG entry

CHANGELOG.md

@@ -26,6 +26,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ### Fixed
 - Don't crash so hard when email settings are invalid.
 - Checking activated Upload Filters for required commands.
+- Remote users can no longer reappear after being deleted.
+- Deactivated users may now be deleted.
 - Mix task `pleroma.database prune_objects`
 
 ### Removed

lib/pleroma/user.ex

@@ -1730,7 +1730,7 @@ def purge_user_changeset(user) do
   # Purge doesn't delete the user from the database.
   # It just nulls all its fields and deactivates it.
   # See `User.purge_user_changeset/1` above.
-  def purge(%User{} = user) do
+  defp purge(%User{} = user) do
     user
     |> purge_user_changeset()
     |> update_and_set_cache()