[FIX] mass_mailing_custom_unsubscribe: contacts model rename

As the mail contacts model is renamed, we need to update the Reference
field data with it.

TT30414

mass_mailing_custom_unsubscribe/__manifest__.py

@@ -6,7 +6,7 @@
     "name": "Customizable unsubscription process on mass mailing emails",
     "summary": "Know and track (un)subscription reasons, GDPR compliant",
     "category": "Marketing",
-    "version": "13.0.1.0.2",
+    "version": "13.0.2.0.0",
     "depends": ["mass_mailing"],
     "data": [
         "security/ir.model.access.csv",

mass_mailing_custom_unsubscribe/migrations/13.0.2.0.0/pre-migration.py

@@ -0,0 +1,17 @@
+# Copyright 2021 Tecnativa - David Vidal
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+from openupgradelib import openupgrade
+
+
+@openupgrade.migrate()
+def migrate(env, version):
+    openupgrade.logged_query(
+        env.cr,
+        """
+        UPDATE mail_unsubscription
+        SET unsubscriber_id = replace(
+            unsubscriber_id, 'mail.mass_mailing.contact', 'mailing.contact'
+        )
+        WHERE unsubscriber_id LIKE 'mail.mass_mailing_contact%'
+        """,
+    )