Upgrade JSON Toolkit to `b5c8f63fbc4b4b7a9cd4bdd71774d89db6ee2a99` (#… #997

Job	Run time
test (macos-latest, clang, clang++, static)	2m 49s
test (macos-latest, clang, clang++, shared)	2m 16s
test (ubuntu-latest, clang, clang++, static)	2m 34s
test (ubuntu-latest, gcc, g++, static)	2m 44s
test (ubuntu-latest, clang, clang++, shared)	2m 56s
test (ubuntu-latest, gcc, g++, shared)	2m 21s
test (windows-latest, static)	3m 19s
test (windows-latest, shared)	3m 23s
test (ubuntu-latest, clang, clang++, static, -DHYDRA_UNDEFINED_SANITIZER:BOOL=ON)	2m 42s
	25m 4s

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