[libgit2-glib] Fix deprecation

[Alberto Fanjul <albfan src gnome org>]

commit 9204df5e17ea5b7c1b8820efbbe2011ea2177b27
Author: Alberto Fanjul <albertofanjul gmail com>
Date:   Thu Dec 23 03:19:46 2021 +0100

    Fix deprecation

 libgit2-glib/ggit-signature.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/libgit2-glib/ggit-signature.c b/libgit2-glib/ggit-signature.c
index bd43cd1..7181db1 100644
--- a/libgit2-glib/ggit-signature.c
+++ b/libgit2-glib/ggit-signature.c
@@ -381,7 +381,7 @@ ggit_signature_get_time_zone (GgitSignature *signature)
        time_zone_id = g_strdup_printf ("%s%02i:%02i",
                                        s->when.offset >= 0 ? "+" : "-",
                                        hours, minutes);
-       time_zone = g_time_zone_new (time_zone_id);
+       time_zone = g_time_zone_new_identifier (time_zone_id);
 
        g_free (time_zone_id);