Update to match OpenXR 1.0.29 specification for consistency and for loading new function pointers for new extensions, including META passthrough preferences.
See OpenXR 1.0.29 SDK release log for details: https://github.com/KhronosGroup/OpenXR-Docs/releases/tag/release-1.0.29
Full Changelog: 1.0.28...1.0.29