[SharovBot] Fix data race between buildFiles and recalcVisibleFiles (… #6955

Job	Run time
test-hive (engine, auth, 0)	3m 47s
test-hive (engine, withdrawals, 0)	6m 45s
test-hive (engine, api, 0)	7m 12s
test-hive (engine, exchange-capabilities, 0)	3m 48s
test-hive (rpc, compat, 23)	3m 4s
test-hive (engine, cancun, 3)	9m 1s
	33m 37s

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