devel/spirv-llvm-translator: update to 20.1.6/19.1.11/18.1.16/1[5-7].0.16/14.0.15/11.0.5

Changes: https://github.com/KhronosGroup/SPIRV-LLVM-Translator/releases/tag/v11.0.4
Changes: https://github.com/KhronosGroup/SPIRV-LLVM-Translator/releases/tag/v14.0.14
Changes: https://github.com/KhronosGroup/SPIRV-LLVM-Translator/releases/tag/v15.0.15
Changes: https://github.com/KhronosGroup/SPIRV-LLVM-Translator/releases/tag/v16.0.15
Changes: https://github.com/KhronosGroup/SPIRV-LLVM-Translator/releases/tag/v17.0.15
Changes: https://github.com/KhronosGroup/SPIRV-LLVM-Translator/releases/tag/v18.1.15
Changes: https://github.com/KhronosGroup/SPIRV-LLVM-Translator/releases/tag/v19.1.10
Changes: https://github.com/KhronosGroup/SPIRV-LLVM-Translator/releases/tag/v20.1.5
Reported by: GitHub (watch releases)