Vala 0.50.1
===========
 * Various improvements and bug fixes:
  - codegen:
    + Don't falsly use g_return_val_if_fail() for async creation method [#1077]
    + Don't pass CCodeFunctionCall to NULL-aware free macro
  - vala:
    + Improve parsing of with-statement and allow it as embedded statement
    + Prioritize the usage of an existing with-variable instance,
      Recognize previously inserted implicit access to with-variable [#1043]
  - parser: Allow to begin expression with statement keyword [#1073]
  - g-i: Fix a couple of C compiler warnings
  - libvaladoc: Fix a couple of C compiler warnings
  - testrunner: Pass --enable-checking to increase coverage, Filter external
    -0X flags to preserve current default -O0
  - build: Stop passing obsolete --use-header

 * Bindings:
  - gstreamer: Update from 1.19.0+ git master
  - gtk4: Don't skip LayoutManager.create_layout_child() [#1071]
  - gtk4: Update to 3.99.1+15b635d7
  - vapi: Update GIR-based bindings
  - webkit2gtk-4.0: Update to 2.30.1