WebKitGTK 2.38.4 released!

This is a bug fix release in the stable 2.38 series.

Improve GStreamer multimedia playback across the board with improved codec selection logic, better handling of latency, and improving frame discard to avoid audio/video desynchronization, among other fixes.
Disable HLS media playback by default, which makes web sites use MSE instead. If needed WEBKIT_GST_ENABLE_HLS_SUPPORT=1 can be set in the environment to enable it back.
Disable threaded rendering in GTK4 builds by default, as it was causing crashes.
Fix MediaSession API not showing artwork images.
Fix MediaSession MPRIS usage when running inside a Flatpak sandbox.
Fix input element controls to correctly scale when applying a zoom factor different than the default.
Fix leakage of Web processes in certain situations.
Fix the injected bundle not being found when running inside a sandbox.
Fix the build with ENABLE_INTROSPECTION when cross-compiling.
FIx the build with ENABLE_WEBGL disabled.
Fix the build with GStreamer-based WebRTC enabled.
Fix the build with USE_GTK4 enabled.
Fix several crashes and rendering issues.

Thanks to all the contributors who made possible this release.