chore: clean redefinition of mock_jwk_module in backend tests (#855)

Author: vgrozdanic

tests/test_backends.py

@@ -302,7 +302,6 @@ def test_decode_rsa_aud_iss_jwk_success(self):
         # Payload copied
         self.payload["exp"] = datetime_to_epoch(self.payload["exp"])
 
-        mock_jwk_module = mock.MagicMock()
         with patch("rest_framework_simplejwt.backends.PyJWKClient") as mock_jwk_module:
             mock_jwk_client = mock.MagicMock()
             mock_signing_key = mock.MagicMock()
@@ -335,7 +334,6 @@ def test_decode_jwk_missing_key_raises_tokenbackenderror(self):
             headers={"kid": "230498151c214b788dd97f22b85410a5"},
         )
 
-        mock_jwk_module = mock.MagicMock()
         with patch("rest_framework_simplejwt.backends.PyJWKClient") as mock_jwk_module:
             mock_jwk_client = mock.MagicMock()