[gimp] desktop: update 2.10.28 release date in appdata.

[Jehan <jehanp src gnome org>]

commit e0ac71bfcc5fea89b6e56a3b5872092568ec1d6a
Author: Jehan <jehan girinstud io>
Date:   Fri Sep 10 23:13:01 2021 +0200

    desktop: update 2.10.28 release date in appdata.
    
    (cherry picked from commit 31b44a4f5ced09592aa277da902010952b4e6b79)

 desktop/org.gimp.GIMP.appdata.xml.in.in | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/desktop/org.gimp.GIMP.appdata.xml.in.in b/desktop/org.gimp.GIMP.appdata.xml.in.in
index cfccae03f3..0615308388 100644
--- a/desktop/org.gimp.GIMP.appdata.xml.in.in
+++ b/desktop/org.gimp.GIMP.appdata.xml.in.in
@@ -186,7 +186,7 @@
       </description>
     </release>
 
-    <release version="2.10.28" date="2021-09-07">
+    <release version="2.10.28" date="2021-09-14">
       <description>
         <_p>
           GIMP 2.10.28 fixes a build issue of GIMP 2.10.26, where some