feat(backup): updated to Red 3.5.6+

backup/backup.py

@@ -14,8 +14,7 @@ from redbot.cogs.downloader import errors
 from redbot.cogs.downloader.converters import InstalledCog
 from redbot.core import commands
 from redbot.core.bot import Red
-from redbot.core.utils.chat_formatting import (error, humanize_list,
-                                               text_to_file)
+from redbot.core.utils.chat_formatting import error, humanize_list, text_to_file
 
 
 # pylint: disable=protected-access
@@ -159,17 +158,15 @@ class Backup(commands.Cog):
                     )
                     self.logger.debug("Repository %s already exists", name)
 
-                # This is commented out because errors.AuthenticationError is not yet implemented in Red 3.5.5's Downloader cog.
-                # Rather, it is only in the development version and will be added in version 3.5.6 (or whatever the next version is).
-                # except errors.AuthenticationError as err:
-                #     repo_e.append(f"Authentication error while adding repository {name}. See logs for more information.")
-                #     self.logger.exception(
-                #         "Something went wrong whilst cloning %s (to revision %s)",
-                #         url,
-                #         branch,
-                #         exc_info=err,
-                #     )
-                #     continue
+                except errors.AuthenticationError as err:
+                    repo_e.append(f"Authentication error while adding repository {name}. See logs for more information.")
+                    self.logger.exception(
+                        "Something went wrong whilst cloning %s (to revision %s)",
+                        url,
+                        branch,
+                        exc_info=err,
+                    )
+                    continue
 
                 except errors.CloningError as err:
                     repo_e.append(