[gimp/gimp-2-10] configure: release GIMP 2.10.28.

[Jehan <jehanp src gnome org>]

commit 9f9ff10cf43ce824fd0e49594da3153e85caca45
Author: Jehan <jehan girinstud io>
Date:   Tue Sep 7 22:01:47 2021 +0200

    configure: release GIMP 2.10.28.

 configure.ac | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 90e685f64b..cf3e629a13 100644
--- a/configure.ac
+++ b/configure.ac
@@ -11,11 +11,11 @@ AC_PREREQ(2.54)
 
 m4_define([gimp_major_version], [2])
 m4_define([gimp_minor_version], [10])
-m4_define([gimp_micro_version], [27])
+m4_define([gimp_micro_version], [28])
 m4_define([gimp_real_version],
           [gimp_major_version.gimp_minor_version.gimp_micro_version])
 m4_define([gimp_version], [gimp_real_version])
-m4_define([gimp_interface_age], [27])
+m4_define([gimp_interface_age], [28])
 m4_define([gimp_binary_age],
           [m4_eval(100 * gimp_minor_version + gimp_micro_version)])