Bump nokogiri from 1.16.5 to 1.18.9 in /docs #686

Job	Run time
Set CI/CD metadata	8s
Commit stage / Check file format	5s
Commit stage / Scan dependencies	29s
Commit stage / Check English usage	9s
Commit stage / Lint Terraform	8s
Commit stage / Scan secrets	8s
Commit stage / Count lines of code	6s
Commit stage / Check Markdown format	5s
Test stage / Unit tests	5s
Test stage / Linting	3s
Test stage / Perform static analysis	3s
Test stage / Test coverage	4s
Build stage / Artefact 1	4s
Build stage / Artefact 2	4s
Acceptance stage / Environment set up	4s
Acceptance stage / Load test	5s
Acceptance stage / Security test	5s
Acceptance stage / UI performance test	4s
Acceptance stage / Accessibility test	1m 20s
Acceptance stage / UI test	3s
Acceptance stage / Integration test	6s
Acceptance stage / Contract test	5s
Acceptance stage / Environment tear down	4s
	3m 37s

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