Bump rubocop-govuk from 5.0.2 to 5.0.3 #10588

Job	Run time
Dependency Review scan / dependency-review-push	0s
Dependency Review scan / dependency-review-pr	5s
Lint ERB / Run ERB lint	45s
CodeQL SAST scan / Analyze	1m 57s
Lint JavaScript / Run Standardx	16s
Prettier / Run Prettier	14s
Lint Ruby / Run RuboCop	39s
Lint SCSS / Run Stylelint	13s
Security Analysis / Run Brakeman	39s
Test JavaScript / Run Jasmine	36s
Test Ruby / minitest-matrix (4, 0)	2m 34s
Test Ruby / minitest-matrix (4, 1)	2m 48s
Test features / feature-test-matrix (cucumber:ok)	5m 59s
Test Ruby / minitest-matrix (4, 2)	2m 50s
Test Ruby / minitest-matrix (4, 3)	2m 47s
Test Ruby / Run Minitest	1s
Test features / Run Cucumber	1s
	22m 24s

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