`numba` parallelization fault with `relabel_segmentation`

**Describe the bug**

When running functions that depend on `relabel_segmentation` (ex. the mask generation functions), the process will error out with an OMP error. This seems directly related to `numba` since it's the parallelization driver of this function and almost certainly relies on OpenMP to facilitate this.

@jranek confirmed that converting this function into a non-numba-based routine fixed it.

**Expected behavior**

There should be no error.

**To Reproduce**