[balsa/wip/gtk4] Bump glib dependency to >= 2.56

[Peter Bloomfield <peterb src gnome org>]

commit 7740d64c42c903784fd73ce9758164b6b6005420
Author: Peter Bloomfield <PeterBloomfield bellsouth net>
Date:   Tue Jun 5 20:50:06 2018 -0400

    Bump glib dependency to >= 2.56
    
    so we can use g_clear_handle_id, in the libbalsa_clear_source_id() macro.

 configure.ac | 2 +-
 meson.build  | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index b4dce442..9b9bfea5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -237,7 +237,7 @@ dnl Make sure ld finds zlib:
 LIBS="$LIBS -lz"
 
 PKG_CHECK_MODULES(BALSA, [
-glib-2.0 >= 2.40.0
+glib-2.0 >= 2.56.0
 gtk+-4.0
 gmime-2.6
 gio-2.0
diff --git a/meson.build b/meson.build
index 2dfd85a4..9e3b41c6 100644
--- a/meson.build
+++ b/meson.build
@@ -128,7 +128,7 @@ conf.set('TOOLKIT_CATEGORIES', TOOLKIT_CATEGORIES)
 # #####################################################################
 
 # Dependencies for balsa and balsa_ab:
-glib_dep    = dependency('glib-2.0', version : '>= 2.54.0')
+glib_dep    = dependency('glib-2.0', version : '>= 2.56.0')
 gtk_dep     = dependency('gtk+-4.0')
 gmime_dep   = dependency('gmime-2.6')
 gio_dep     = dependency('gio-2.0')