[server] portable dump format supports now ZIP64 extensions by default (closes #1912535)
ZIP files can use the ZIP64 extensions when the zipfile is larger than 2 GB.
zipfile will raise an exception when the ZIP file would require ZIP64 extensions.
Note: ZIP64 extensions are disabled by default in stdlib because the default
zip and unzip commands on Unix (the InfoZIP utilities) don’t support these
extensions.