Bump govuk_app_config from 8.0.2 to 8.1.0 #1667

Job	Run time
Test Ruby	1m 16s
Lint JavaScript / Run Standardx	19s
Lint Ruby / Run RuboCop	20s
Lint SCSS / Run Stylelint	14s
Security Analysis / Run Brakeman	17s
Test JavaScript / Run Jasmine	58s
	3m 24s

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