cups: upgrade 2.4.11 -> 2.4.12

cups: upgrade 2.4.11 -> 2.4.12

Changelog:
===========
- GnuTLS follows system crypto policies now
- Added 'NoSystem' SSLOptions value
- Now we raise alert for certificate issues
- Added Kyocera USB quirk
- The scheduler now logs a job's debugging history if the backend fails
- Fixed a potential timing issue with 'cupsEnumDests'
- Fixed a potential "lost PPD" condition in the scheduler
- Fixed a compressed file error handling bug
- Fixed a bug in the make-and-model whitespace trimming code
- Fixed a removal of IPP Everywhere permanent queue if installation failed
- Fixed 'ServerToken None' in scheduler
- Fixed invalid IPP keyword values created from PPD option names
- Fixed handling of "media" and "PageSize" in the same print request
- Fixed client raster printing from macOS
- Fixed the default User-Agent string.
- Fixed a recursion issue in 'ippReadIO'.
- Fixed handling incorrect radix in 'scan_ps()'
- Fixed validation of dateTime values with time zones more than UTC+11
- Fixed attributes returned by the Create-Xxx-Subscriptions requests
- Fixed 'ippDateToTime' when using a non GMT/UTC timezone
- Fixed 'job-completed' event notifications for jobs that are cancelled before
  started
- Fixed DNS-SD discovery with 'ippfind'

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>