Build release artifacts

Remove unused `size.py` and refs to removed CPython files #285

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Run time

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Job	Run time
verify-input	6s
build-source	1m 4s
build-docs	5m 14s
build-android (x86_64)	18m 29s
build-android (aarch64)	4m 1s
test-source	9m 38s
test-docs	37s
	39m 9s