fix: rename vds_slug_edit auth function

The action was renamed in 102cdbc, but apparently the auth function was never renamed.

Part of fixing NaturalHistoryMuseum/ckanext-nhm#871.

Author: alycejenni

ckanext/versioned_datastore/logic/slug/auth.py

@@ -12,5 +12,5 @@ def vds_slug_resolve(context, data_dict) -> dict:
 
 
 @auth(anon=True)
-def vds_slug_edit(context, data_dict) -> dict:
+def vds_slug_reserve(context, data_dict) -> dict:
     return {'success': True}