Bump govuk_publishing_components from 35.15.2 to 35.16.0 #622

Job	Run time
Integration tests	1m 5s
Lint SCSS / Run Stylelint	11s
Lint JavaScript / Run Standardx	17s
Lint Ruby / Run RuboCop	17s
Security Analysis / Run Brakeman	14s
Test Ruby / Run RSpec	52s
Test JavaScript / Run Jasmine	52s
	3m 48s

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