refactor(adfs_credentials_provider): explicitly specify lxml as parser for server response

Author: Brooke-white

redshift_connector/plugin/adfs_credentials_provider.py

@@ -49,7 +49,7 @@ def form_based_authentication(self: "AdfsCredentialsProvider") -> str:
             raise InterfaceError(e)
 
         try:
-            soup = bs4.BeautifulSoup(response.text)
+            soup = bs4.BeautifulSoup(response.text, features="lxml")
         except Exception as e:
             _logger.error("An error occurred while parsing response: {}".format(str(e)))
             raise InterfaceError(e)
@@ -89,7 +89,7 @@ def form_based_authentication(self: "AdfsCredentialsProvider") -> str:
             raise InterfaceError(e)
 
         try:
-            soup = bs4.BeautifulSoup(response.text)
+            soup = bs4.BeautifulSoup(response.text, features="lxml")
         except Exception as e:
             _logger.error("An error occurred while parsing response: {}".format(str(e)))
             raise InterfaceError(e)