Roll external/spirv-headers/ 124a9665e..b8b9eb864 (3 commits)

KhronosGroup/SPIRV-Headers@124a966...b8b9eb8

$ git log 124a9665e..b8b9eb864 --date=short --no-merges --format='%ad %ae %s'
2023-08-16 viktoria.maksimova Headers support for two Intel extensions (KhronosGroup#356)
2023-08-10 dneto Revert "Merge pull request KhronosGroup#367 from dneto0/coop-matrix-enums-deps"
2023-07-29 konstantin.seurer Add SPV_AMDX_shader_enqueue

Created with:
  roll-dep external/spirv-headers

DEPS

@@ -13,7 +13,7 @@ vars = {
   'protobuf_revision': 'v21.12',
 
   're2_revision': '08d338fe481fe19adde12fa24b014412d15bdfa0',
-  'spirv_headers_revision': '124a9665e464ef98b8b718d572d5f329311061eb',
+  'spirv_headers_revision': 'b8b9eb8640c8c0107ba580fbcb10f969022ca32c',
 }
 
 deps = {