[gnote/gnome-3-38] Bump required GTK version to 3.22.20

[Aurimas Černius <aurimasc src gnome org>]

commit ff1c3af275ebe55a22bd72cda924c87f4120920f
Author: Aurimas Černius <aurisc4 gmail com>
Date:   Sun Nov 15 21:28:04 2020 +0200

    Bump required GTK version to 3.22.20

 configure.ac | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index e07bb831..39c01ee8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -23,9 +23,9 @@ AC_DEFINE_UNQUOTED([LIBGNOTE_VERSION_INFO], ["$LIBGNOTE_VERSION_INFO"], [libgnot
 dnl all the library version.
 dnl if one is harcoded elsewhere, it is a bug
 
-GTK_VERSION=3.20
+GTK_VERSION=3.22.20
 LIBGLIBMM_VERSION=2.62
-LIBGTKMM_VERSION=3.18
+LIBGTKMM_VERSION=3.22.20
 GSPELL_VERSION=1.6.0
 LIBSECRET_VERSION=0.8
 UNITTESTCPP_VERSION=1.5.1