package/perl-lwp-mediatypes: bump to version 6.04

package/perl-lwp-mediatypes: bump to version 6.04

The license file is changed from README, which contained just the
following license details:

"""
    This library is free software; you can redistribute it and/or modify it
    under the same terms as Perl itself.
"""

to the more complete LICENSE file, which didn't exist back in the 6.02
version. This LICENSE file contains the usual GPL or Artistic license
text.

Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
[Thomas: add details about the license file change]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>