refactor: use std slices, maps package #831

Job	Run time
fetch-oracle	2m 8s
fetch-redhat	4m 42s
fetch-amazon	2m 18s
fetch-debian	3m 20s
fetch-fedora	6m 48s
fetch-opensuse	3m 34s
fetch-opensuse-leap	6m 26s
fetch-ubuntu	5m 39s
fetch-alpine	2m 22s
fetch-suse-enterprise-desktop	8m 26s
fetch-suse-enterprise-server	14m 37s
	1h 0m 20s

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