Ensure that instance names are treated as positional args (#6780)

redbot/_update/cmd/cog_compatibility.py

@@ -169,11 +169,12 @@ async def call(
         "redbot._update",
         *debug_args,
         CMD_NAME,
-        instance_name,
         arg_names.RED_VERSION,
         str(red_version),
         arg_names.PYTHON_VERSION,
         str(python_version),
+        "--",
+        instance_name,
     ]
     if ignore_prefix:
         args.append(arg_names.CHECK_OTHER_PYTHON_INSTALLS)

redbot/_update/internal.py

@@ -393,6 +393,7 @@ async def _call_cog_update(instance_name: str, *, update_repos: bool) -> Tuple[i
         "redbot._update.internal",
         *debug_args,
         _UPDATE_COGS_CMD_NAME,
+        "--",
         instance_name,
     ]
     if update_repos:

redbot/_update/updater.py

@@ -653,6 +653,7 @@ class Updater:
                 "redbot.setup",
                 "backup",
                 *debug_args,
+                "--",
                 instance_name,
                 str(instance_backups_dir),
             )