Replace assertDictContainsSubset by assertEqual #104

Job	Run time
Build source distribution	13s
Build extra arch aarch64 wheels	1h 55m 32s
Build wheels ubuntu-20.04 (x86_64)	19m 31s
Build wheels ubuntu-20.04 (PyPy)	1m 5s
Build wheels windows-latest (win64)	23m 46s
Build wheels windows-latest (PyPy)	4m 57s
Build wheels macos-latest (all)	18m 8s
Build wheels macos-13 (all)	29m 11s
Build wheels macos-latest (PyPy)	1m 0s
upload_pypi	0s
	3h 33m 23s

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