Bump govuk_app_config from 9.6.0 to 9.7.0 #1088

Job	Run time
Lint Ruby / Run RuboCop	19s
Lint JavaScript / Run Standardx	19s
Lint SCSS / Run Stylelint	11s
Security Analysis / Run Brakeman	19s
Test JavaScript / Run Jasmine	44s
Test Ruby / Run Minitest	4m 56s
	6m 48s

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