webkitgtk: upgrade 2.36.3 -> 2.36.4

Changes:

Fix the new ATSPI accessibility implementation to add the missing Collection interface for the loaded document.
Fix the MediaSession implementation to make the MPRIS object names more sandbox friendly, which plays better with Flatpak and WebKit’s own Bubblwrap-based sandboxing.
Fix leaked Web Processes in some particular situations.
Fix the build with media capture support enabled.
Fix cross-compilation when targeting 64-bit ARM.
Fix several crashes and rendering issues.

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 2396f8de)
Signed-off-by: Steve Sakoman <steve@sakoman.com>