devel/spirv-llvm-translator: update to 16.0.20/14.0.19

Changes: https://github.com/KhronosGroup/SPIRV-LLVM-Translator/releases/tag/v14.0.19
Changes: https://github.com/KhronosGroup/SPIRV-LLVM-Translator/releases/tag/v16.0.20
Reported by: GitHub (watch releases)