Added merge environmental settings to prepared request (#1811)

Author: Gabefire

libs/labelbox/src/labelbox/client.py

@@ -254,7 +254,13 @@ def convert_value(value):
 
             prepped: requests.PreparedRequest = request.prepare()
 
-            response = self._connection.send(prepped, timeout=timeout)
+            settings = self._connection.merge_environment_settings(
+                prepped.url, {}, None, None, None
+            )
+
+            response = self._connection.send(
+                prepped, timeout=timeout, **settings
+            )
             logger.debug("Response: %s", response.text)
         except requests.exceptions.Timeout as e:
             raise labelbox.exceptions.TimeoutError(str(e))