Upgrade JSON Toolkit to `a3765c8` #263

Job	Run time
docker	1m 32s
test (ubuntu-latest, clang, clang++, sh)	1m 19s
test (ubuntu-latest, gcc, g++, sh)	1m 12s
test (macos-13, clang, clang++, sh)	2m 14s
test (macos-14, clang, clang++, sh)	56s
test (windows-latest, pwsh)	4m 13s
	11m 26s

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