Build release artifacts

Remove unused `size.py` and refs to removed CPython files (#343) #324

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Job	Run time
verify-input	12s
build-source	1m 9s
build-android (x86_64)	19m 32s
build-android (aarch64)	3m 39s
build-docs	5m 15s
test-source	9m 40s
test-docs	31s
	39m 58s