[vala] (12 commits) Non-fast-forward update to branch wip/manual

[Rico Tzschichholz <ricotz src gnome org>]

The branch 'wip/manual' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  88c1dde... doc: Update from https://wiki.gnome.org/Projects/Vala/Manua

Commits added to the branch:

  0d3ed86... Revert "codegen: g_free is already NULL-safe" (*)
  bbff74e... tests: Add testcase for double-free regression (*)
  ac2af40... gtk+-4.0: Update to 3.89.3 (*)
  7310504... vapi: "ref" functions must return an unowned value (*)
  3575b12... vapi: Remove clutter-json-1.0 (*)
  da1ab33... vapi: Update GIR-based bindings (*)
  bc5bba3... vapi: Update GIR-based bindings (*)
  665d2a8... vapi: Update GIR-based bindings (*)
  6b275cf... gdk-2.0: Include gdk/gdkkeysyms.h for Gdk.Key (*)
  c73d19c... codegen: Don't return void for non-nullable simple-type str (*)
  4cab2c2... glib-2.0: Add uuid_string_* symbols (*)
  313efa3... doc: Update from https://wiki.gnome.org/Projects/Vala/Manua

(*) This commit already existed in another branch; no separate mail sent