fix: change set auth to sync method

[silentworks]

What kind of change does this PR introduce?

Bug fix.

What is the current behavior?

set_auth is called async but this won't work when used with supabase-py because the auth change event happens in a sync method.

What is the new behavior?

set_auth is called sync and the auth change event can use the sync method.

Additional context

Add any other context or screenshots.

[J0]

Hey,

Thanks for PR! Just checking - is this one ready for review?

[silentworks]

It is ready for review but I do believe its also a breaking change for anyone using realtime-py as a standalone library. I was going to try another approach of passing a header in like all the other libraries and update that instead.