[seahorse] Bump minimal GLib version to 2.58

[Niels De Graef <nielsdg src gnome org>]

commit 07e6c3474142144ba4608a33a4cea23a8b73a5ba
Author: Niels De Graef <nielsdegraef gmail com>
Date:   Sun Jun 7 13:58:11 2020 +0200

    Bump minimal GLib version to 2.58
    
    We started requiring this when we started using the `G_SOURCE_FUNC()`
    macro. It's also not too new, since it's supported in the current Debian
    stable.

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index 5d0e28aa..398604e3 100644
--- a/meson.build
+++ b/meson.build
@@ -24,7 +24,7 @@ else
 endif
 
 # Dependencies
-min_glib_version = '2.44'
+min_glib_version = '2.58'
 min_gcr_version = '3.11.91'
 accepted_gpg_versions = [ '2.0.12', '2.1.4', '2.2.0' ]
 gpg_check_version = find_program('build-aux' / 'gpg_check_version.py')