Release v5.9.0

[domoscargin]

What

Release a new version of GOV.UK Frontend with the latest changes we've built.

Why

So people can use this new version

Who needs to work on this

Technical writers, Developers

Who needs to review this

Technical writers, Developers

Done when

Comms preparation

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1. Prepare release notes and comms for v5.9.0 #5718
   comms 🚀 release +2

GOV.UK Frontend

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1. Follow our process to release GOV.UK Frontend to npm and GitHub

Design System site

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1. Bump the version of govuk-frontend
2. Update the "What's new" section on the homepage
3. Update the "Recently shipped" section of the roadmap
4. WIP: Add deprecation tag govuk-design-system#4488
   🚀 release +1
5. Add guidance to deprecate 'Header with service name' govuk-design-system#4490
   +0
6. Guidance change to File upload component govuk-design-system#4458
   accessibility file upload +2

Frontend docs

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1. Bump the version of govuk-frontend

Comms

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1. Send comms on Slack channels
2. Send comms to mailing list

Logistics

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1. Ensure issues published in the release are gathered in a GitHub milestone
2. 🔑 Ensure that relevant access tokens are up to date
3. Verify that decisions are appropriately documented (in code/issues/pull request comments or in separate documents linked from issues/pull requests)
4. Update state of published issues on project board
5. Close published issues when appropriate
6. Open any follow-up issues if necessary

[domoscargin]

Targeting w/c 3 March

[calvin-lau-sig7]

Google docs for:

1. Changelog and release notes
2. Release comms, including email, Slack messages, etc.