gnu: gnome-shell: Update to 3.20.1.

* gnu/packages/gnome.scm (gnome-shell): Update to 3.20.1.

gnu/packages/gnome.scm

@@ -4594,7 +4594,7 @@ properties, screen resolution, and other GNOME parameters.")
 (define-public gnome-shell
   (package
     (name "gnome-shell")
-    (version "3.20.0")
+    (version "3.20.1")
     (source (origin
               (method url-fetch)
               (uri (string-append "mirror://gnome/sources/" name "/"
@@ -4602,7 +4602,7 @@ properties, screen resolution, and other GNOME parameters.")
                                   name "-" version ".tar.xz"))
               (sha256
                (base32
-                "125qjrbw40r8rpri9y0yrl5yqs2q4x0l5inzi3vwl0rxvmhz8sgf"))))
+                "08cgbr15cim3rgcngrv98rm48pkdxwj4nqx5za1lsnv376m4x5bs"))))
     (build-system glib-or-gtk-build-system)
     (arguments
      '(#:phases