Test version 8 beta release

[frankieroberto]

Before we release it, we should test the package with a variety of existing prototypes.

Pull requests / upgrade commits:

• Use NHS Prototype kit package nhsuk-prototype-kit#688
• Use the new beta nhsuk-prototype-kit NHSDigital/record-a-vaccination-prototype#535 ✅
• Use nhsuk-prototype-kit version 8 package NHSDigital/manage-breast-screening-prototype#192
• Switch to nhsuk-prototype-kit package manage-vaccinations-in-schools-prototype#178
• NHSDigital/book-vaccinations-prototype@1ba8d18 (Book a vaccination)
• Update to v8 NHSDigital/DCH-NHS-app#3
• WIP: v8 update NHSDigital/mya-prototype#5

[frankieroberto]

Closing this, as 8.0.0 has now been released! 🎉