Bump govuk_app_config from 8.0.2 to 9.0.3 #280

Job	Run time
Lint Ruby / Run RuboCop	35s
Lint JavaScript / Run Standardx	12s
Lint SCSS / Run Stylelint	14s
Security Analysis / Run Brakeman	25s
Test JavaScript / Run Jasmine	1m 17s
Test Ruby / Run Minitest	10m 15s
	12m 58s

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