[gnome-control-center] Bump libhandy to 0.90.0

[Robert Ancell <rancell src gnome org>]

commit bccbaf5e43ec2b5f8d940c44e5dd8d8e088646c8
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Fri Aug 7 14:03:42 2020 +0200

    Bump libhandy to 0.90.0
    
    The API is now stable.

 meson.build          | 2 +-
 subprojects/libhandy | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/meson.build b/meson.build
index 6e7930d34..05dbe651a 100644
--- a/meson.build
+++ b/meson.build
@@ -99,7 +99,7 @@ libgvc = subproject(
 )
 libgvc_dep = libgvc.get_variable('libgvc_dep')
 
-libhandy_dep = dependency('libhandy-1', version: '>= 0.84.0', required: false)
+libhandy_dep = dependency('libhandy-1', version: '>= 0.90.0', required: false)
 if not libhandy_dep.found()
   libhandy = subproject(
     'libhandy',
diff --git a/subprojects/libhandy b/subprojects/libhandy
index 3a61bd9c6..c7aaf6f4f 160000
--- a/subprojects/libhandy
+++ b/subprojects/libhandy
@@ -1 +1 @@
-Subproject commit 3a61bd9c6bc95f5418ef5376a99632d103162d49
+Subproject commit c7aaf6f4f50b64ee55fcfee84000e9525fc5f93a