Upgrade v8 to v9

[sheno]

i followed this post

V8 to v9 upgrade error domainification 'DocType' object has no attribute 'restrict_to_domain'

ok had a breakthrough this post - Error Executing erpnext.patches.v9_0.fix_subscription_next_date - #2 by rohit_w got me to thinking. So I tried bench --force reload-doc core doctype page and then ran another bench update and it worked!