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Use `ConcurrentHashMap` in Stamp.scala #834

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Run time

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Job	Run time
test (ubuntu-latest, 8, 1)	11m 36s
test (ubuntu-latest, 11, 1)	11m 57s
test (ubuntu-latest, 21, 1)	10m 51s
test (windows-latest, 8, 2)	11m 54s
test (ubuntu-latest, 21, 3)	16m 33s
test (ubuntu-latest, 21, 4)	41s
	1h 3m 32s