* Replace `Str[OrBytes]Path` with `str`
A filesystem path is not valid as an abstract resource.
`TraversableResources` cannot only accept strings if `ResourceReader`
accepts both bytes and strings. `importlib.resources` does not work
with bytes in any case and `ResourceReader` is typed as taking
a `typing.Text` object in `importlib.resources`' source code.
* Update `joinpath` signature from Python 3.11
