chore(release): finalize client v0.12.0 stable release #467

Job	Run time
go-tests / unit_tests	3m 22s
go-lint / golangci	3m 13s
pre-commit / pre-commit	3m 50s
sol-tests / Timestamp / timestamp	1s
sol-tests / Foundry Unit Test	1m 2s
	11m 28s

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