Correct type hint for Command.options

Previously, this was typed as a single-element tuple.

squash_bot/core/command.py

@@ -61,7 +61,7 @@ def is_user(self) -> bool:
 class Command:
     name: str
     description: str
-    options: tuple[CommandOption]
+    options: tuple[CommandOption, ...]
 
     def parse_options(self, base_context: dict[str, typing.Any]) -> dict[str, typing.Any]:
         data = base_context["data"]