Bump govuk_app_config from 9.11.2 to 9.13.0 #726

Job	Run time
CodeQL SAST scan / Analyze	1m 25s
Lint Ruby / Run RuboCop	22s
Dependency Review scan / dependency-review-push	0s
Dependency Review scan / dependency-review-pr	10s
Security Analysis / Run Brakeman	28s
Test Ruby / Run RSpec	1m 49s
	4m 14s

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