455891 G'MIC: update to

Merged Amy spark requested to merge lsegovia/krita:work/amyspark/455891-gmic into master

BUG: 455891

@rempt: tarball is available at the usual place, please copy to files.kde.org.

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Formalities Checklist

  • I confirmed this builds.
  • I confirmed Krita ran and the relevant functions work.
  • I tested the relevant unit tests and can confirm they are not broken. (If not possible, don't hesitate to ask for help!)
  • I made sure my commits build individually and have good descriptions as per KDE guidelines.
  • I made sure my code conforms to the standards set in the HACKING file.
  • I can confirm the code is licensed and attributed appropriately, and that unattributed code is mine, as per KDE Licensing Policy.

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