Z-axis upper-bound check in `check_skip_move` uses `nxt_x` instead of `nxt_z`

[xbb]

Not sure if a bug, here:

topologiq/src/topologiq/core/pathfinder/spatial.py

Line 219 in 1c8d9eb

or nxt_x > bounding_box["z"]["max"]

[jbolns]

100% typo

[jbolns]

Thanks @xbb . The related PR that you submitted was merged alongside #39 .
Looking forward to future issues/PRs.