CI: Use a sha for the Windows SPIRV-LLVM-Translator dependency
SPIRV-LLVM-Translator recently made a change to update their LLVM version to 13, but didn't branch/tag a 12 release. Let's use a specific sha from before that bump happened.
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SPIRV-LLVM-Translator recently made a change to update their LLVM version to 13, but didn't branch/tag a 12 release. Let's use a specific sha from before that bump happened.