fix: return json for successful userSignOut

return json when signout request is successful so that frontend can get redirect url with res?.redirect_url on signout

src/lib/apis/auths/index.ts

@@ -336,7 +336,7 @@ export const userSignOut = async () => {
 	})
 		.then(async (res) => {
 			if (!res.ok) throw await res.json();
-			return res;
+			return res.json();
 		})
 		.catch((err) => {
 			console.error(err);