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Aha! Thanks for the list of extensions. You have afform_admin enabled and in 5.45 it started requiring search_kit. So it must be looking for it after upgrade.
If you've already upgraded and have access to the mysql database, you can do update civicrm_extension set is_active = 0 where full_name='org.civicrm.afform_admin'; to disable afform-admin temporarily ...
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