Vulkan: Explicitly set SPIR-V version Bug: angleproject:342316794 Change-Id: Ide73e3d8b167a932338419cb9da3ea358058ebeb Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5564203 Reviewed-by: Amirali Abdolrashidi <abdolrashidi@google.com> Reviewed-by: Yuxin Hu <yuxinhu@google.com> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>