Bump govuk_publishing_components from 35.20.1 to 35.21.2 #553

Job	Run time
Lint SCSS / Run Stylelint	13s
Lint JavaScript / Run Standardx	14s
Lint Ruby / Run RuboCop	2m 51s
Security Analysis / Run Brakeman	29s
Test JavaScript / Run Jasmine	1m 27s
Test Ruby / Run RSpec	3m 57s
	9m 11s

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