fix(PPDSC-2104): increase next version to >12.1.1

[mstuartf]

PPDSC-2104

What

1. Background: package.json for local next app being generated in the wrong location after upgrading to 12.1.
2. Increase next version to 12.1.1, which includes a fix for this behaviour.

I have done:

• Written unit tests against changes
• Written functional tests against the component and/or NewsKit site
• Updated relevant documentation

I have tested manually:

• The feature's functionality is working as expected on Chrome, Firefox, Safari and Edge
• The screen reader reads and flows through the elements as expected.
• There are no new errors in the browser console coming from this PR.
• When visual test is not added, it renders correctly on different browsers and mobile viewports (Safari, Firefox, small mobile viewport, tablet)
• The Playground feature is working as expected

[newskit-engineering]

You can preview these changes on:
Documentation Site: http://ncu-newskit-docs.s3-website-eu-west-1.amazonaws.com/ppdsc-2104-prevent-untracked-next-package-json
Storybook: http://ncu-newskit-docs.s3-website-eu-west-1.amazonaws.com/ppdsc-2104-prevent-untracked-next-package-json/storybook