Refs #32168 -- Fixed Publisher assertions in AggregationTests.test_more_more.
Refs #32168 -- Fixed Publisher assertions in AggregationTests.test_more_more.

Refer to Publisher objects instead of Books.

Test regression in 1bf25e9bc6df6c2ae4c0b10fb839e101471e8373.

blighj/django,felixxm/django,adamchainz/django,koordinates/django,ghickman/django,wkschwartz/django,dsanders11/django,shaib/django,solarissmoke/django,shaib/django,elena/django,blighj/django,manhhomienbienthuy/django,wkschwartz/django,atul-bhouraskar/django,solarissmoke/django,shaib/django,MarkusH/django,dsanders11/django,apollo13/django,freakboy3742/django,rsalmaso/django,pauloxnet/django,django/django,rsalmaso/django,adamchainz/django,rsalmaso/django,koordinates/django,felixxm/django,apollo13/django,adamchainz/django,felixxm/django,takis/django,pauloxnet/django,django/django,pauloxnet/django,shaib/django,blighj/django,wkschwartz/django,auvipy/django,wkschwartz/django,solarissmoke/django,freakboy3742/django,rsalmaso/django,atul-bhouraskar/django,koordinates/django,dsanders11/django,takis/django,solarissmoke/django,django/django,blighj/django,adamchainz/django,atul-bhouraskar/django,MarkusH/django,auvipy/django,ghickman/django,manhhomienbienthuy/django,koordinates/django,apollo13/django,elena/django,ghickman/django,django/django,freakboy3742/django,takis/django,MarkusH/django,apollo13/django,dsanders11/django,monetate/django,MarkusH/django,monetate/django,takis/django,atul-bhouraskar/django,manhhomienbienthuy/django,monetate/django,pauloxnet/django,auvipy/django,monetate/django,elena/django,ghickman/django,elena/django,auvipy/django,manhhomienbienthuy/django,felixxm/django