[gimp] Release development version GIMP 2.99.6.

[Jehan <jehanp src gnome org>]

commit bf1b405a741dec679cf6f5a51d2f9afbe8163097
Author: Jehan <jehan girinstud io>
Date:   Mon Apr 26 02:42:36 2021 +0200

    Release development version GIMP 2.99.6.

 configure.ac | 4 ++--
 meson.build  | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 4be87d186d..9d6420c540 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], [99])
-m4_define([gimp_micro_version], [5])
+m4_define([gimp_micro_version], [6])
 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], [5])
+m4_define([gimp_interface_age], [6])
 m4_define([gimp_binary_age],
           [m4_eval(100 * gimp_minor_version + gimp_micro_version)])
 
diff --git a/meson.build b/meson.build
index b2332fb356..bab790ad47 100644
--- a/meson.build
+++ b/meson.build
@@ -1,6 +1,6 @@
 project('gimp',
   'c', 'cpp',
-  version: '2.99.5',
+  version: '2.99.6',
   meson_version: '>=0.50.0',
   default_options: [
     'cpp_std=gnu++14',