- Update to 2023.6.0
# Enhancements
* #1259, add maxdepth fo cp/get/put
* #1263, allow dir modification during walk()
* #1264, add boxfs to registry
* #1266, optimise referenceFS lazy lookups, especially for
writing parquet
* #1287, 1288 "encoding" for FTP
# Fixes
* #1273, (re)allow reading .zstd reference sets
* #1275, resource.error for win32
* #1278, range reads in dbfs
* #1282, create parent directories in get_file
* #1283, off-by-one in reference block writing
* #1286, strip protocol in local rm_file
# Other
* #1267, async bulk tests
* #1268, types and mypy
* #1277, 1279, drop outdated forms io.open, IOError