Bump govuk_publishing_components from 50.0.0 to 50.0.1 #18

Job	Run time
Lint JavaScript	14s
Lint ERB / Run ErbLint	23s
Lint Ruby / Run RuboCop	25s
Lint SCSS / Run Stylelint	20s
Security Analysis / Run Brakeman	29s
Test Ruby / Run RSpec	3m 32s
Test JavaScript / Run Jasmine	36s
	5m 59s

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