Bump axios and govuk-prototype-kit (#217)

Removes [axios](https://github.com/axios/axios). It's no longer used after updating ancestor dependency govuk-prototype-kit. These dependencies need to be updated together.


Removes `axios`

Updates `govuk-prototype-kit` from 13.16.0 to 13.16.1

---
updated-dependencies:
- dependency-name: axios
  dependency-type: indirect
- dependency-name: govuk-prototype-kit
  dependency-type: direct:production
...

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