rust-filepatterns: fix type of warnings tuple to (bytes, bytes)
Otherwise warn() in match.py would fail if the warning contains non-ASCII
character.
We might want to add a thin ByteString wrapper around Vec<u8> to
implement ToPyObject<ObjectType = PyBytes>, but I'm not sure.
[workspace]
members = ["hg-core", "hg-direct-ffi", "hg-cpython"]
exclude = ["chg", "hgcli"]