aTbRef updated for v8.9.2

[mwra (Mark Anderson)]

aTbRef has been updated for v8.9.2: https://www.acrobatfaq.com/atbref8/index.html

Change log: https://www.acrobatfaq.com/atbref8/index/ChangeLog/v892b49611Feb2021.html

[pmaheshwari (Prashant Maheshwari)]

Thanks as always for maintaining this .