Update gpu benchmark
This MR should update the GPU Benchmark test case according to findings on A100 benchmark runs.
Since the block size exceeds the int32 limit on some runs cell_index_t should be adapted to int_64.
This MR should update the GPU Benchmark test case according to findings on A100 benchmark runs.
Since the block size exceeds the int32 limit on some runs cell_index_t should be adapted to int_64.