Update dependency sass to v1.71.1 - autoclosed #2272

Job	Run time
Dependencies, Unit tests (16)	1m 27s
Static analysis	1m 37s
Dependencies, Unit tests (18)	3m 17s
Dependencies, Unit tests (20)	1m 25s
Build libraries	1m 57s
Build application (govuk-docs)	2m 11s
Build application (govuk-template)	1m 36s
Test application (govuk-docs, chromium)	1m 53s
Test application (govuk-docs, firefox)	3m 38s
Test application (govuk-docs, electron)	1m 11s
Test application (govuk-template, chromium)	2m 12s
Test application (govuk-template, firefox)	1m 25s
Test application (govuk-template, electron)	1m 23s
	25m 12s

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