[gegl] ops: update reference hash for color-reduction op

[Øyvind "pippin" Kolås <ok src gnome org>]

commit e294d3f0ad0d570b07dbe4e70d1ca0383dc609aa
Author: John <jtm home gmail com>
Date:   Fri Feb 26 17:31:12 2021 +0000

    ops: update reference hash for color-reduction op

 operations/common/dither.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/operations/common/dither.c b/operations/common/dither.c
index dbbfeef78..22d21e3cc 100644
--- a/operations/common/dither.c
+++ b/operations/common/dither.c
@@ -618,7 +618,7 @@ gegl_op_class_init (GeglOpClass *klass)
     "compat-name", "gegl:color-reduction",
     "title",       _("Dither"),
     "categories",  "dither",
-    "reference-hash", "f28ecb303ab9ffbcb0c32033b2fd2dcf",
+    "reference-hash", "e9de784b7a9c200bb7652b6b58a4c94a",
     "description", _("Reduce the number of colors in the image, by reducing "
                      "the levels per channel (colors and alpha). Different dithering methods "
                      "can be specified to counteract quantization induced banding."),