[gatsby][types] added typings for `StaticQuery` children prop (#6020)
[gatsby][types] added typings for `StaticQuery` children prop (#6020)

Since #6007 you can now pass a children prop inside `<StaticQuery>`.

I've also removed the typing inside RenderCallback to allow users to
add custom typings to the `data` callback. There's probably a better way
to do this, but I'll leave it like this for now.
mingaldrichgan/gatsby,gatsbyjs/gatsby,0x80/gatsby,fk/gatsby,gatsbyjs/gatsby,0x80/gatsby,fk/gatsby,ChristopherBiscardi/gatsby,gatsbyjs/gatsby,ChristopherBiscardi/gatsby,mingaldrichgan/gatsby,mingaldrichgan/gatsby,ChristopherBiscardi/gatsby,gatsbyjs/gatsby,fk/gatsby,ChristopherBiscardi/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,0x80/gatsby