Merge pull request #1693 from alphagov/fix-sass-deprecations #991

Job	Run time
Integration tests	2m 13s
Test Ruby	1m 39s
CodeQL SAST scan / Analyze	1m 33s
Dependency Review scan / dependency-review-pr	0s
Dependency Review scan / dependency-review-push	4s
Lint Ruby / Run RuboCop	17s
Security Analysis / Run Brakeman	35s
Test JavaScript / Run Jasmine	36s
	6m 57s

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