Update dependency @canonical/cookie-policy to v3.1.2

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@canonical/cookie-policy	3.1.1 -> 3.1.2

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Release Notes

canonical-web-and-design/cookie-policy

### [`v3.1.2`](https://togithub.com/canonical-web-and-design/cookie-policy/releases/v3.1.2) [Compare Source](https://togithub.com/canonical-web-and-design/cookie-policy/compare/v3.1.1...v3.1.2) #### New in Cookie policy v3.1.2 ##### 🚀 Features - Focus the modal when it opens #### 🐛 Bug Fixes - Block scrolling on the background content while modal is open - Add `aria-hidden` attribute to the content while modal is open

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