build: update dependency bazel_skylib to v1.8.0 #625

Job	Run time
list	25s
workflow (modules-builder-tests)	38s
workflow (build-cli)	39s
workflow (devkit-core-tests-rerun)	39s
workflow (devkit-core-tests)	38s
workflow (build-unit-tests)	38s
	3m 37s

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