Check automaticRadius type in search response is string

[aseure]

A user of the Go client reported
on support that they had issue while the Go client was deserializing the
automaticRadius field of a geo search query.

The Algolia documentation says
the type of automaticRadius is a string but, as of today, the written type
annotation is marked to float.

Let's make sure that this field is correctly typed as a string (and not a
float), as it should.

For the record, to make automaticRadius in a search response, you need to
perform a search query with:

• with a geo parameter such as aroundLatLng
• without any aroundRadius search parameter
• have records in your index that will match the geo query, so they need to
  have a _geoloc attribute