coverage: fix dkjson install #3965

Job	Run time
run-perf-tests-ce (1.10, 1.0.0, 2.8.0)	34m 6s
run-tests-ee (1.10, tarantool-enterprise-sdk-1.10.15-0-r609, 2.8.0)	7m 24s
run-perf-tests-ce (2.11, 1.0.0, 2.8.0)	34m 13s
run-tests-ce (1.10.6, 2.8.0)	8m 14s
run-tests-ee (1.10, tarantool-enterprise-sdk-1.10.15-0-r609, 1.0.0, 2.8.0)	7m 16s
run-perf-tests-ce (3.0.0, 0.1.25)	39m 10s
run-tests-ee (2.11, tarantool-enterprise-sdk-nogc64-2.11.2-0-r609.linux.x86_64, 2.8.0)	7m 44s
run-tests-ce (1.10, 2.8.0)	7m 31s
run-tests-ee (2.11, tarantool-enterprise-sdk-nogc64-2.11.2-0-r609.linux.x86_64, 1.0.0, 2.8.0)	8m 35s
run-tests-ce (2.8, 2.8.0)	8m 9s
run-tests-ee (3.0, tarantool-enterprise-sdk-gc64-3.0.0-0-gf58f7d82a-r23.linux.x86_64, 0.1.25)	8m 35s
run-tests-ce (2.10, 2.8.0)	7m 12s
run-tests-ce (2.11, 2.8.0)	7m 32s
run-tests-ce (1.10, 1.0.0, 2.8.0)	7m 39s
run-tests-ce (2.7, 2.8.0)	8m 40s
run-tests-ce (2.10, 0.10.0, 2.7.9)	7m 10s
run-tests-ce (2.11, 1.0.0, 2.8.0, true)	11m 56s
run-tests-ce (2.11, 1.0.0, 0.1.25)	3m 7s
run-tests-ce (3.0.0, 0.1.25)	13m 44s
run-tests-ce (master, 0.1.26)	21m 47s
	4h 19m 44s

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