webkitgtk: upgrade 2.48.2 -> 2.48.5

webkitgtk: upgrade 2.48.2 -> 2.48.5

Changelog:
2.48.5:
Fix several crashes.

2.48.4:
Improve emoji font selection with USE_SKIA=ON.
Improve playback of multimedia streams from blob URLs.
Fix the build with USE_SKIA_OPENTYPE_SVG=ON and USE_SYSPROF_CAPTURE=ON.
Fix the build on LoongArch with USE_SKIA=ON.
Fix crash when using a WebKitWebView widget in an offscreen window.
Fix several crashes and rendering issues.

2.48.3:
Fix a crash introduced by the new threaded rendering implementation using Skia API.
Improve rendering performance by recording layers once and replaying every dirty region in different worker threads.
Fix a crash when setting WEBKIT_SKIA_GPU_PAINTING_THREADS=0.
Fix a reference cycle in webkitmediastreamsrc preventing its disposal.

Signed-off-by: Gyorgy Sarvari <skandigraun@gmail.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>