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Fix `sha256sum` -> `sha256_sum` to match Django model #214

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Run time

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Job	Run time
verify-input	15s
build-docs	5m 17s
build-android (aarch64)	4m 14s
build-source	1m 16s
build-android (x86_64)	18m 21s
test-source	10m 2s
	39m 25s