[Python3] Replace deprecated `assertEquals()` to fix py3.12 compat #1062

Job	Run time
cpp-lib-build (macos-12, clang, ON)	6m 21s
cpp-lib-build (macos-12, clang, OFF)	3m 52s
cpp-lib-build (macos-12, gcc, ON)	4m 18s
build (macos-12, tool)	1m 38s
build (macos-12, cpp)	36m 38s
cpp-lib-build (macos-12, gcc, OFF)	3m 33s
build (macos-12, csharp)	10m 26s
cpp-lib-build (ubuntu-20.04, clang, ON)	3m 42s
build (macos-12, dart)	6m 4s
cpp-lib-build (ubuntu-20.04, clang, OFF)	3m 12s
build (macos-12, go)	2m 59s
cpp-lib-build (ubuntu-20.04, gcc, ON)	3m 6s
build (macos-12, java)	1m 58s
cpp-lib-build (ubuntu-20.04, gcc, OFF)	3m 12s
build (macos-12, javascript)	3m 43s
cpp-lib-build (windows-2022, clang, ON)	4m 42s
build (macos-12, typescript)	21m 3s
cpp-lib-build (windows-2022, clang, OFF)	5m 10s
build (macos-12, php)	2m 45s
cpp-lib-build (windows-2022, cl)	4m 11s
build (macos-12, python3)	4m 59s
build (ubuntu-20.04, tool)	54s
build (ubuntu-20.04, cpp)	17m 19s
build (ubuntu-20.04, csharp)	5m 45s
build (ubuntu-20.04, dart)	3m 27s
build (ubuntu-20.04, go)	2m 23s
build (ubuntu-20.04, java)	1m 8s
build (ubuntu-20.04, javascript)	1m 28s
build (ubuntu-20.04, typescript)	9m 55s
build (ubuntu-20.04, php)	1m 41s
build (ubuntu-20.04, python3)	1m 8s
build (windows-2022, tool)	1m 21s
build (windows-2022, cpp)	22m 34s
build (windows-2022, csharp)	7m 17s
build (windows-2022, dart)	4m 21s
build (windows-2022, go)	5m 23s
build (windows-2022, java)	1m 38s
build (windows-2022, javascript)	2m 2s
build (windows-2022, typescript)	21m 22s
build (windows-2022, php)	1m 56s
build (windows-2022, python3)	1m 46s
	4h 12m 20s

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