fix(treewide): manual ruff fixes

(cherry picked from commit f63396ef47)
Signed-off-by: Akhil Narang <me@akhilnarang.dev>

erpnext/crm/doctype/appointment_booking_settings/appointment_booking_settings.py

@@ -3,6 +3,7 @@
 
 
 import datetime
+import typing
 
 import frappe
 from frappe import _
@@ -36,7 +37,7 @@ class AppointmentBookingSettings(Document):
 		success_redirect_url: DF.Data | None
 	# end: auto-generated types
 
-	agent_list = []  # Hack
+	agent_list: typing.ClassVar[list] = []  # Hack
 	min_date = "01/01/1970 "
 	format_string = "%d/%m/%Y %H:%M:%S"