build: update rules_sass digest to 4a54e0e #1922

Job	Run time
list	26s
workflow (build-cli)	1m 44s
workflow (devkit-core-tests)	1m 14s
workflow (devkit-core-tests-rerun)	1m 16s
workflow (modules-builder-tests)	1m 49s
workflow (build-unit-tests)	2m 14s
	8m 43s

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