Bump github.com/cometbft/cometbft from 0.37.3-0.20230920093934-46df7b597e3c to 0.38.6 in /versiondb #5821

Job	Run time
integration_tests (unmarked)	10m 35s
integration_tests (ibc)	9m 48s
integration_tests (ibc_rly_evm)	8m 7s
integration_tests (ibc_rly_gas)	7m 11s
integration_tests (ibc_timeout)	6m 56s
integration_tests (ibc_update_client)	7m 43s
integration_tests (ica)	10m 34s
integration_tests (gov)	7m 4s
integration_tests (upgrade)	9m 49s
integration_tests (slow)	12m 7s
integration_tests (gas)	7m 43s
upload-cache	0s
	1h 37m 37s

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