Remove long-deprecated assertEquals uses

These have been removed in Python 3.12:
https://docs.python.org/3/whatsnew/3.12.html#id3

Bug: 388344853
Test: atest edit_monitor_test -- --abi x86_64
Test: atest daemon_manager_test -- --abi x86_64
Change-Id: I8c398390f194ae5e384fe7dab98adbd9d0770f11