[evolution] Bump glib requirement to 2.56, due to used functions from that version

[Milan Crha <mcrha src gnome org>]

commit 380eaa38d7a5babe7630436f21b0a29d46857dc8
Author: Milan Crha <mcrha redhat com>
Date:   Wed Nov 11 16:18:11 2020 +0100

    Bump glib requirement to 2.56, due to used functions from that version
    
    Related to https://gitlab.gnome.org/GNOME/evolution-ews/-/issues/134

 CMakeLists.txt | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4c76c86474..b3314b344e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -48,8 +48,8 @@ set(PROJECT_DISTCONFIGURE_PARAMS
 )
 
 # Keep these two definitions in agreement.
-set(glib_minimum_version 2.46)
-set(glib_encoded_version GLIB_VERSION_2_46)
+set(glib_minimum_version 2.56)
+set(glib_encoded_version GLIB_VERSION_2_56)
 
 # Keep these two definitions in agreement.
 set(gdk_minimum_version 3.22)