release: removed the 6.3.0 tag The revision having two tags confuses some of the build script trying to fetch the version. So, remove the "bad" tag for now.

cffi: fix a bytes vs str issue on macOS when listing directories This code hasn't been touched in recent years, and the other implementation return bytes for the filename, so I assume this is a holdover from the py2 days. I was unable to test it on mac though, because the `_osutil` import failed.