DOCS: Add dep updates steps to rel-eng #21

Job	Run time
integration-test-providers	9s
integration-tests (AZURE_DNS)	9m 32s
integration-tests (BIND)	1m 56s
integration-tests (CLOUDFLAREAPI)	10m 5s
integration-tests (CNR)	10m 33s
integration-tests (DIGITALOCEAN)	5m 1s
integration-tests (GANDI_V5)	6m 18s
integration-tests (GCLOUD)	4m 43s
integration-tests (NAMEDOTCOM)	4m 30s
integration-tests (HEXONET)	4m 47s
integration-tests (HEDNS)	6m 14s
integration-tests (NS1)	2m 58s
integration-tests (ROUTE53)	4m 18s
integration-tests (SAKURACLOUD)	4m 29s
integration-tests (TRANSIP)	6m 1s
	1h 21m 34s

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