[Refactoring] Replace deprecated usage of `new JsonParser` #7733

Job	Run time
Build Ballerina Lang	2m 38s
Build Ballerina Distribution	40m 24s
Build Stdlib Level (1)	3m 45s
Build Stdlib Level (2)	13m 41s
Build Stdlib Level (4)	14m 33s
Build Stdlib Level (3)	5m 3s
Build Stdlib Level (5)	38m 36s
Build Stdlib Level (6)	19m 6s
Build Stdlib Level (8)	35m 14s
Build Stdlib Level (7)	26m 59s
Build Stdlib Level (9)	4m 12s
	3h 24m 11s

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