fix(aiohttp): Prevent double access of .json

Previously both the `request` and `search` methods called `await r.json()`, leading to the `search` method calling `.json()` on a dictionary. This caused the following error: `'dict' object has no attribute 'json'`

google_custom_search/adapter.py

@@ -107,4 +107,4 @@ async def search(self, *args, **kwargs) -> List[Item]:
         r = await self.request(
             "GET", "/", params=self._payload_maker(*args, **kwargs)
         )
-        return self._from_dict(await r.json())
+        return self._from_dict(r)