[fix] Compute accesses returns false results when the altitude is too low

[loft-nicolas-sanchez]

Describe the bug
I've run into an issue when I (wrongly) set the altitude of a ground station at 0m instead of 13m, and got back fragmented accesses.
This is apparently a known issue, due to surface aliasing / numerical noise when the altitude is too low.

Steps to reproduce
Steps to reproduce the behavior (add code snippets as needed):
Using the function ostk.astrodynamics.access.Generator.compute_accesses
https://github.com/open-space-collective/open-space-toolkit-astrodynamics/blob/main/src/OpenSpaceToolkit/Astrodynamics/Access/Generator.cpp

Expected behavior
If the error itself cannot be solve, ensure the altitude is always high enough to avoid this problem.

Additional context
none

Potential suggestion
none