Log Message:
gnome-shell: Update x11/gnome-shell to 40.2

40.2
====
* Unbreak Xwayland apps when not using systemd in user session [Olivier; !1850]
* Fix distributed man pages [Florian; !1859]
* Avoid unnecessary icon shadow changes [Daniel; !1869]
* Immediately start app grid drags for non-touch devices [Georges; !1872]
* Handle screencast failures more gracefully [Florian; !1878]
* Fixed crashes [Gustavo; !1848]
* Misc. bug fixes [Georges, Florian, Daniel; !1867, !1854, !1860, !1876]

Contributors:
  Olivier Fourdan, Florian Müllner, Georges Basile Stavracas Neto,
  Gustavo Noronha Silva, Daniel van Vugt

Translators:
  Quentin PAGÈS [oc], Cheng-Chia Tseng [zh_TW], Hugo Carvalho [pt]