Bump govuk_publishing_components from 35.21.2 to 35.21.3 #561

Job	Run time
Lint SCSS / Run Stylelint	13s
Lint JavaScript / Run Standardx	18s
Test JavaScript / Run Jasmine	1m 33s
Lint Ruby / Run RuboCop	36s
Security Analysis / Run Brakeman	25s
Test Ruby / Run RSpec	3m 59s
	7m 4s

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