[gimp/gimp-2-10] configure: post-release version bump to 2.10.31.

[Jehan <jehanp src gnome org>]

commit 571791f53fd315b810d6ee3621dfbe3caac566ad
Author: Jehan <jehan girinstud io>
Date:   Sun Dec 19 22:51:39 2021 +0100

    configure: post-release version bump to 2.10.31.

 configure.ac | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index f64cc80426..c07852c726 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], [30])
+m4_define([gimp_micro_version], [31])
 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], [30])
+m4_define([gimp_interface_age], [31])
 m4_define([gimp_binary_age],
           [m4_eval(100 * gimp_minor_version + gimp_micro_version)])