Update wayland-server to 0.31 #3396

Job	Run time
format	23s
clippy-check	2m 27s
check-msrv	5m 49s
check-minimal	1m 47s
smithay-tests	1m 58s
smithay-tests (backend_winit)	2m 42s
smithay-tests (backend_drm)	1m 49s
smithay-tests (backend_gbm)	2m 27s
smithay-tests (backend_egl)	1m 56s
smithay-tests (backend_libinput)	2m 1s
smithay-tests (backend_udev)	1m 37s
smithay-tests (backend_session)	2m 17s
smithay-tests (backend_session_libseat)	1m 46s
smithay-tests (backend_vulkan)	1m 49s
smithay-tests (backend_x11)	2m 47s
smithay-tests (desktop)	1m 36s
smithay-tests (renderer_gl)	1m 41s
smithay-tests (renderer_glow)	1m 49s
smithay-tests (renderer_multi)	2m 12s
smithay-tests (wayland_frontend)	2m 14s
smithay-tests (xwayland)	2m 41s
smithay-tests (default)	5m 9s
smithay-tests (test_all_features)	4m 10s
Documentation on Github Pages	2m 7s
smallvil	1m 44s
anvil-tests	1m 37s
anvil-tests (egl)	1m 17s
anvil-tests (winit)	1m 54s
anvil-tests (udev)	3m 43s
anvil-tests (x11)	2m 10s
anvil-tests (default)	2m 40s
anvil-tests (test_all_features)	2m 31s
WLCS: Core tests	1m 13s
WLCS: Output tests	1m 25s
WLCS: Pointer input tests	1m 17s
WLCS: Bad Buffer Test	1m 49s
	1h 20m 34s

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