This parameter has been inconsistently typed as either list[str] or
tuple[str] - as either is acceptable, we can widen the type to
Sequence[str] to satisfy `mypy` and/or other type checkers.

This will allow for constructs like:
```Python
application.run_polling(
    allowed_updates=(
        UpdateType.MESSAGE,
        UpdateType.EDITED_MESSAGE,
    )
)
```
which currently fails mypy (and likely other typecheckers) with an error
like:
`error: Argument "allowed_updates" to "run_polling" of "Application" hasincompatible type "tuple[UpdateType, UpdateType]"; expected "list[str] | None"  [arg-type]`