Update Docker image to use BAP 1.5.0

[jlacomis]

I was trying to train a model trying to use the Docker container provided, but ran into an issue where it would use a lot (128GB+) of RAM. I tracked the problem down to BAP using a lot of memory on specific binaries in my dataset. I spoke to the BAP authors and it turns out the problem is a known issue with some x86 instructions exploding the state in BAP 1.4.0, which is being used here. Updating to BAP 1.5.0 fixes this issue.