Update SPIRV submodules (#5815)

* Update SPIRV submodules

With the latest SPIR-V submodules, one of tests started failing:
tests/gpu-feature/texture/query/footprint/nv-shader-texture-footprint.slang

[ForceInline] is added to GLSL texture functions in order to inline %true and %false.
Without it, the value was indirectly passed down via a function parameter, which broke the existing test.

Also the test is modified to use -DAG, because the order unpredictably changed for Grad variants due to additional [ForceInline] marks for Gradient functions.

A new validation check in SPIRV-Tools was causing a validation error:
```
error: line 324: [VUID-StandaloneSpirv-OpTypeImage-06924] Cannot store to OpTypeImage, OpTypeSampler, OpTypeSampledImage, or OpTypeAccelerationStructureKHR objects
  OpStore %17 %242
```

It appears that this is a bug on SPIRV-Tools.
A proper fix is proposed to Khronos/SPIRV-Tools:
https://github.com/KhronosGroup/SPIRV-Tools/pull/5914

But this commit uses `shader-slang/SPIRV-Tools/fix_for_OpImageSampleFootprintNV` with a custom fix as a temporary solution:
https://github.com/shader-slang/SPIRV-Tools/tree/fix_for_OpImageSampleFootprintNV

1 files changed, 0 insertions, 0 deletions

diff --git a/external/spirv-headers b/external/spirv-headers
-Subproject 2a9b6f951c7d6b04b6c21fe1bf3f475b68b8480
+Subproject 3f17b2af6784bfa2c5aa5dbb8e0e74a607dd8b3