Remove coercion of AWS ip range response to text

Our tests and mocked this network request to
return parsed json, but the actual implementation
was still fetching text. This fixes the exception we saw

apps/greencheck/importers/importer_amazon.py

@@ -50,7 +50,7 @@ def fetch_data_from_source(self) -> dict:
         Fetch the data from the endpoint, returning the parsed json
         """
         try:
-            response = requests.get(settings.AMAZON_REMOTE_API_ENDPOINT).text
+            response = requests.get(settings.AMAZON_REMOTE_API_ENDPOINT)
             return response.json()
         except requests.RequestException:
             logger.warning("Unable to fetch ip data. Aborting early.")