Fix benchmark JSON serialization (#644) #2178

Job	Run time
check	7m 49s
build	8m 23s
docker-targets-build (${{ matrix.platform.platform }})	0s
cli-tests	21m 13s
integration-tests	16m 9s
sharding-tests	15m 16s
unit-tests	13m 17s
worker-tests-group1	8m 58s
worker-tests-group2	22m 17s
worker-tests-group3	8m 51s
worker-tests-group4	8m 29s
worker-tests-group5	15m 17s
docker-publish	0s
publish	0s
	2h 25m 59s

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