Change GET parameters from requests data to urlencoded

Exchange no longer accepts parameters for GET requests in request data. Adding code to ._query to url-encode parameters passed to data, and set data to empty dict to reduce redundant data in request

krakenex/api.py

@@ -134,6 +134,9 @@ def _query(self, urlpath, data, headers=None, timeout=None):
         # Since January 2024, public endpoints only support GET.
         if '/public/' in urlpath:
             call_function = self.session.get
+            get_data = urllib.parse.urlencode(data)
+            url += '?' + get_data
+            data = {}
         else:
             call_function = self.session.post