libplist: Update rootfile for operation with python-3.10.8

libplist: Update rootfile for operation with python-3.10.8

- With python-3.10.8 the plist.so is no longer available in the site packages.
   libplist libraries are still available.
- libplist is only used as a dependency for shairport-sync
   Tested by installing shairport-sync and starting/stopping it. Started and stopped
   successfully without any error messages. This would suggest that the libplist
   libraries are probably being picked up successfully. Cannot test properly as I have
   no Apple/iOS or related products.

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>