fix: GET request are called with application/json value in Content-Type

[filipfdevelit]

🐛 The bug

DevTools are adding Content-Type header with application/json value to GET requests.

According to RFC 7231:

A payload within a GET request message has no defined semantics;
sending a payload body on a GET request might cause some existing
implementations to reject the request.

GET request shouldn't be sending a body thus application/json value doesn't fit.

🛠️ To reproduce

https://github.com/filipfdevelit/repl-nuxt-dev-tools-content-type-get-request

🌈 Expected behavior

DevTools are not adding application/json to Content-Type header for GET requests.

ℹ️ Additional context

No response