internal json v3: parse ruby source checksum correctly #25943

Job	Run time
syntax	49s
tap syntax	4m 59s
cask audit	2m 27s
formula audit	6m 25s
docker	4m 10s
update-test (Ubuntu 22.04)	1m 4s
vendored gems	47s
update-test (macOS 13)	48s
test default formula (Ubuntu 22.04)	4m 7s
test default formula (Ubuntu 20.04)	5m 7s
test default formula (macOS 13 x86_64)	2m 25s
tests (online)	7m 38s
test default formula (macOS 14 arm64)	1m 18s
tests (generic OS)	5m 42s
tests (Ubuntu 22.04)	5m 58s
tests (Ubuntu 20.04)	6m 3s
tests (macOS 13 x86_64)	7m 25s
tests (macOS 14 arm64)	8m 58s
	1h 16m 10s

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