spirv_headers is unmaintained, use spirv instead

Because of versioning issues; the spirvheaders crate is unmaintained. Use spirv for parsing spirv files...

PT-2021-28382

Name of the Vulnerable Software and Affected Versions: spirv headers crate affected versions not specified Description: The issue is related to versioning problems with the spirv headers crate, which is currently unmaintained. This affects the parsing of spirv files. Recommendations: At the momen...