Upgrade to @iconify/utils because @iconify/json-tools is depreciated about astro-icon

[Pukimaa]

@natemoo-re told me he would wanted to fix that. But nothing has happened since sadly. If I remember correctly he also talked about making this repo an official astro repo. I don't know how far they're with the plan. But it would be something I would be looking forward as well.

[surjithctly]

Making this an official implementation would be a great idea indeed considering its popularity.

[stramel]

Yes, this is something that we're intending to address in the next major release. I think once we get the next major release out we can discuss bringing it into the official package.

[surjithctly]

Related: #29

[stramel]

This will be covered under the v1 rework. #87