CTranslate2 1.20.0

Changes

• Drop Python 3.5 support
• Docker image tags suffixed with -gpu are no longer updated to prefer tags with an explicit CUDA version

Fixes and improvements

• Fix int8 quantization for rows that only contain zeros
• Fix type error when running the CUDA code path of the Multinomial operator
• Add EOS score to the greedy search final score for consistency with the beam search output
• Use third party library google/cpu_features to resolve CPU features at runtime
• Small optimizations when manipulating tensor shapes and indices
• Internal refactoring of Transformer layers