Update dependency govuk-frontend to v4.8.0 #2133

Job	Run time
Static analysis	1m 31s
Static analysis	1m 31s
Dependencies, Unit tests (16)	1m 29s
Dependencies, Unit tests (16)	1m 29s
Dependencies, Unit tests (18)	1m 30s
Dependencies, Unit tests (18)	1m 30s
Dependencies, Unit tests (20)	1m 23s
Dependencies, Unit tests (20)	1m 23s
Build libraries	2m 2s
Build libraries	2m 2s
Build application (govuk-docs)	2m 13s
Build application (govuk-docs)	2m 13s
Build application (govuk-template)	1m 45s
Build application (govuk-template)	1m 45s
Test application (govuk-docs, chromium)	3m 8s
Test application (govuk-docs, chromium)	3m 8s
Test application (govuk-docs, firefox)	2m 59s
Test application (govuk-docs, firefox)	1m 24s
Test application (govuk-docs, electron)	2m 44s
Test application (govuk-docs, electron)	2m 44s
Test application (govuk-template, chromium)	2m 52s
Test application (govuk-template, chromium)	1m 34s
Test application (govuk-template, firefox)	2m 56s
Test application (govuk-template, firefox)	1m 45s
Test application (govuk-template, electron)	3m 2s
Test application (govuk-template, electron)	1m 49s
	53m 51s

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