fix: Include Item variant patch in patches.txt (#18961)

diff --git a/erpnext/patches.txt b/erpnext/patches.txt
index 2af1269..2f74d54 100644
--- a/erpnext/patches.txt
+++ b/erpnext/patches.txt
@@ -632,4 +632,5 @@
 erpnext.patches.v12_0.add_default_dashboards
 erpnext.patches.v12_0.remove_bank_remittance_custom_fields
 erpnext.patches.v12_0.generate_leave_ledger_entries
-erpnext.patches.v12_0.move_credit_limit_to_customer_credit_limit
\ No newline at end of file
+erpnext.patches.v12_0.move_credit_limit_to_customer_credit_limit
+erpnext.patches.v12_0.add_variant_of_in_item_attribute_table
diff --git a/erpnext/patches/v12_0/add_variant_of_in_item_attribute_table.py b/erpnext/patches/v12_0/add_variant_of_in_item_attribute_table.py
index bc61190..bb13078 100644
--- a/erpnext/patches/v12_0/add_variant_of_in_item_attribute_table.py
+++ b/erpnext/patches/v12_0/add_variant_of_in_item_attribute_table.py
@@ -1,8 +1,8 @@
 import frappe
 
 def execute():
-    frappe.db.sql('''
-        UPDATE `tabItem Variant Attribute` t1
-        INNER JOIN `tabItem` t2 ON t2.name = t1.parent
-        SET t1.variant_of = t2.variant_of
-    ''')
+	frappe.db.sql('''
+		UPDATE `tabItem Variant Attribute` t1
+		INNER JOIN `tabItem` t2 ON t2.name = t1.parent
+		SET t1.variant_of = t2.variant_of
+	''')