Bump govuk_publishing_components from 35.14.0 to 35.15.0 #564

Job	Run time
Integration tests	1m 4s
Lint JavaScript / Run Standardx	15s
Lint Ruby / Run RuboCop	27s
Lint SCSS / Run Stylelint	15s
Security Analysis / Run Brakeman	26s
Test JavaScript / Run Jasmine	1m 5s
Test Ruby / Run RSpec	1m 5s
	4m 37s

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