Python testing

bump jsonchain version #20

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Run time

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Job	Run time
build (macos-latest, 3.13)	25s
build (macos-latest, 3.11)	9s
build (windows-latest, 3.13)	1m 5s
build (ubuntu-latest, 3.12)	14s
build (windows-latest, 3.12)	1m 12s
build (windows-latest, 3.11)	1m 6s
build (macos-latest, 3.12)	17s
build (ubuntu-latest, 3.13)	15s
build (ubuntu-latest, 3.11)	10s
	4m 53s