Bump govuk_publishing_components from 35.15.0 to 35.15.1 #580

Job	Run time
Integration tests	1m 20s
Lint JavaScript / Run Standardx	14s
Lint Ruby / Run RuboCop	24s
Lint SCSS / Run Stylelint	13s
Security Analysis / Run Brakeman	17s
Test JavaScript / Run Jasmine	55s
Test Ruby / Run RSpec	50s
	4m 13s

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