Fix lint

src/pystencils/backend/ast/vector.py

src/pystencils/backend/platforms/cuda.py

src/pystencils/backend/transformations/loop_vectorizer.py

src/pystencils/compound_op_mapping.py

src/pystencils/jit/gpu_cupy.py

src/pystencils/sympyextensions/reduction.py