What's new in the WebKitGTK 2.39.6 release?
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  - Add support for speech synthesis using Flite.
  - Bring back WebKitConsoleMessage API implementation.
  - Fix async scroll event propagation for GTK4.
  - Add network session API when building with GTK4.
  - Make most public types final when building with GTK4.
  - Remove WebKitPrintCustomWidget when building with GTK4.
  - Remove most of the webkit_web_view_new_with_*() constructors when building with GTK4.
  - Remove webkit_web_context_get/set_process_model when building with GTK4.
  - Do not allow the sandbox to mount the entire home directory.
  - Fix several crashes and rendering issues.