Vulkan release 1.1.123 with two new extensions

​Last week saw the release of Vulkan 1.1.123. The release sees four issues from GitHub addressed and several Khronos internal issues fixed. Two new extensions have also be included: VK_KHR_shader_subgroup_extended_type: enables the Non Uniform Group Operations in SPIR-V to support 8-bit integer, 16-bit integer, 64-bit integer, 16-bit floating-point, and vectors of these types, and VK_GOOGLE_user_type: allows use of the SPV_GOOGLE_user_type extension in SPIR-V shader modules.