refactor: remove unused code

Author: NguyenHoangSon96

tests/test_WriteApi.py

@@ -528,8 +528,6 @@ def test_writes_default_tags_dict_without_tag(self):
 
     def test_redirect(self):
         from urllib3 import Retry
-        Retry.DEFAULT_REMOVE_HEADERS_ON_REDIRECT = frozenset()
-        Retry.DEFAULT.remove_headers_on_redirect = Retry.DEFAULT_REMOVE_HEADERS_ON_REDIRECT
         self.influxdb_client.close()
 
         retries = Retry(redirect=1, remove_headers_on_redirect=[])
@@ -548,9 +546,6 @@ def test_redirect(self):
         self.assertEqual('Token my-token', requests[0].headers['Authorization'])
         self.assertEqual('Token my-token', requests[1].headers['Authorization'])
 
-        from urllib3 import Retry
-        Retry.DEFAULT.remove_headers_on_redirect = Retry.DEFAULT_REMOVE_HEADERS_ON_REDIRECT
-
     def test_named_tuple(self):
         httpretty.register_uri(httpretty.POST, uri="http://localhost/api/v2/write", status=204)