chore: audit `x/upgrade` module #3495

Job	Run time
docker-security-build / prepare-env	3s
docker-txsim-build / prepare-env	2s
docker-txsim-build / docker-security	3m 37s
docker-security-build / docker-security	2m 49s
docker-security-build / docker-build	3m 6s
docker-txsim-build / docker-build	2m 56s
	12m 33s

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