package/libblockdev: bump to version 3.2.1
For change log, see:
https://github.com/storaged-project/libblockdev/blob/3.2.1/NEWS.rst
Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
[Julien: add link to change log]
Signed-off-by: Julien Olivain <ju.o@free.fr>