release: bump VSCode extension version to 21.2.4

release: cut the v22.0.0-rc.1 release

release: cut the v21.2.14 release

release: cut the v22.0.0-rc.0 release

release: cut the v21.2.13 release

release: cut the v20.3.21 release

release: cut the v19.2.22 release

release: cut the v22.0.0-next.12 release

release: cut the zone.js-0.16.2 release

release: cut the v22.0.0-next.11 release