Setting the Accept header when opening the REST client

[StephenGilboy]

When using the REST client to call SurrealDB on OSX the response would always return a 405. It turns out the Warp HTTP lib that Surreal is using was rejecting the request when the Accept header was missing.

[ProphetLamb]

Interesting, thanks for the fix!
We actually had the Accept header early on, but there was an issue on the windows client with both accept and Content-Type headers. Let's see if someone complains,^^ If so we can add an Environment.OsVersion.Platform constraint. Thought I suspect the issue stemmed from somewhere else

(P.S. I was screwing around with the GitHub actions, so ill have to run the CI again)