Roll third_party/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 (google#356)
2023-08-10 dneto Revert "Merge pull request google#367 from dneto0/coop-matrix-enums-deps"
2023-07-29 konstantin.seurer Add SPV_AMDX_shader_enqueue

Created with:
  roll-dep third_party/spirv-headers

DEPS

@@ -10,7 +10,7 @@ vars = {
  'glslang_revision': 'b70669a0593f022af1d10f77d29856e24cfaaa50',
  'googletest_revision': '987e225614755fec7253aa95bf959c09e0d380d7',
  're2_revision': '6148386f0c8f03da1ab0bf982a4dbe080b4ea7bc',
- 'spirv_headers_revision': '124a9665e464ef98b8b718d572d5f329311061eb',
+ 'spirv_headers_revision': 'b8b9eb8640c8c0107ba580fbcb10f969022ca32c',
  'spirv_tools_revision': '8e3da01b45806fbacbb9e6fce9c5f9ae49f60e42',
 }