Update dependency cookie to ^0.6.0 #2260

Job	Run time
Dependencies, Unit tests (16)	1m 21s
Dependencies, Unit tests (18)	1m 25s
Static analysis	1m 31s
Dependencies, Unit tests (20)	1m 23s
Build libraries	2m 8s
Build application (govuk-docs)	2m 12s
Build application (govuk-template)	1m 35s
Test application (govuk-docs, chromium)	1m 35s
Test application (govuk-docs, firefox)	1m 17s
Test application (govuk-docs, electron)	1m 20s
Test application (govuk-template, chromium)	1m 55s
Test application (govuk-template, firefox)	1m 28s
Test application (govuk-template, electron)	1m 35s
	20m 45s

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