style: replaced deprecated io/ioutil package with proper implementations of … #1726

Job	Run time
Run buf actions	2m 8s
Run tests	4m 31s
Run race tests	2m 36s
Run lints and checks	3m 54s
Build CLI docs	1m 22s
Generate SDKs	1m 54s
Generate changelog	0s
Generate release	0s
Draft newsletter	0s
Render version schema	0s
Send newsletter	0s
Pending approval Slack notification	0s
Release SDKs	0s
	16m 25s

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