Log Message:
vala: update to 0.40.7.

Vala 0.40.7
===========
 * Various improvements and bug fixes:
  - Update bugtracker links to https://gitlab.gnome.org/GNOME/vala/issues
  - codegen:
    + Handle delegate_target attribute of fields [#520]
    + Free generic elements of glib collections [#694765]
    + Fix warning for source_funcs parameter of g_source_new()
    + Actually treat GLib.Source as compact class
    + Custom abstract methods of GLib.Source are handled differently [#641]
    + Consistently use gpointer for delegate targets
    + Unify some delegate-type check patterns
    + Use default_init instead of base_init when registering interfaces
      [#699550]
  - girparser: Add support for bool delegate_target [#520]
  - girwriter:
    + Output deprecated="1"
    + construct-only properties don't have a setter method
    + Don't write any custom attributes [#608]
  - valadoc: Fix TreeBuilder.create_array() for stacked Arrays

 * Bindings:
  - glib-2.0:
    + Do not mark simple-type out-parameters as nullable [#634]
    + Make Source.attach() use the default MainContext by default
    + Make Bytes.slice() use the memory-efficient Bytes.from_bytes() [#638]
    + Fix Bytes.with_free_func()
  - gio-2.0:
    + Mark ActionEntry.parameter_type/state fields as nullable [#632]
    + Delegate fields of DBus*VTable do not have implicit target fields
    + Apply delegate_target = false on ActionEntry callbacks and make them weak
      [#630]
    + Add default to all io_priority parameters
  - gstreamer: Cherry-pick some fixes from 0.42, add gst-editing-services-1.0
  - gtk+-3.0: Update to 3.22.30+9ac7f906
  - gtk+-4.0: Update to 3.93.0+29fee2e8
  - webkit2gtk-4.0: Update to 2.21.4
  - Update GIR-based bindings