Roll external/spirv-headers/ 79743b899..e867c0663 (2 commits) (#5427)

KhronosGroup/SPIRV-Headers@79743b8...e867c06

$ git log 79743b899..e867c0663 --date=short --no-merges --format='%ad %ae %s'
2023-10-04 95509728+pradyumans Add a Source Language for Slang (#383)
2023-10-04 95509728+pradyumans Register Slang Compiler for SPIR-V (#382)

Created with:
  roll-dep external/spirv-headers

Co-authored-by: GitHub Actions[bot] <>

DEPS

@@ -13,7 +13,7 @@ vars = {
   'protobuf_revision': 'v21.12',
 
   're2_revision': '26f7d889e1f7e75e95e65490086538edf9f5275c',
-  'spirv_headers_revision': '79743b899fde5c954897b2694291002626358fac',
+  'spirv_headers_revision': 'e867c06631767a2d96424cbec530f9ee5e78180f',
 }
 
 deps = {