Compilation failure with Vala 0.50.0

Building gnome-contacts with vala 0.50.0 fails:

../src/contacts-avatar-utils.vala:129.11-129.20: error: syntax error, no expression allowed between array brackets
    const double[,3] GNOME_COLOR_PALETTE = {
          ^^^^^^^^^^

This fails because of this patch in vala that bubbles up the syntax error in the compiler:

commit 4244751bdf58a397a922f352284c26a5fac49a69 (refs/bisect/bad)
Author: Rico Tzschichholz <ricotz@ubuntu.com>
Date:   Thu Jul 2 13:11:52 2020 +0200

    vala: Don't loose invalid_syntax when copying array type for local variable

    Fixes https://gitlab.gnome.org/GNOME/vala/issues/942

Your branch is missing this simple upstream patch:

https://gitlab.gnome.org/GNOME/gnome-contacts/-/commit/22ac2c6fecc98efd11d96dc3e04938b8777a3510