Update govuk-frontend from `4.0.1` to `4.7.0`

[ekumachidi]

This pull request upgrades the govuk-frontend library from version ^4.0.1 to 4.7.0.

Trello card

https://trello.com/c/D7upaa5C

Context

Ahead of the breaking changes introduced by the release of 5.0, this upgrade brings new features and improvements to the govuk-frontend library, enhancing the user experience and keeping our application up-to-date with the latest design patterns.

Changes proposed in this pull request

This update is part of our ongoing effort to keep our dependencies current. Notably, 4.7.0 is the last upgrade before a major 5.0 release. While this PR doesn't include major breaking changes, it prepares us for the upcoming transition and allows us to identify and address any potential issues early on.

Guidance to review

• Tested locally to ensure the application functions as expected.
• Ensured all existing features are unaffected by the upgrade.
• Checked for any deprecations or warnings during the build process.
• Verified compatibility with other dependencies.

[github-actions[bot]]

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