chore: migration to pyinterp 2026.4.0

[robin-cls]

Pyinterp 2026.2.0 introduces breaking changes. The migration guide must be applied to this project to restore the compatibility with the latest versions.

The 2026.4.0 is our target because it reintroduces per-pait points distance computation.

[robin-cls]

The following query has been used for additional non-regression:

from fcollections.implementations import NetcdfFilesDatabaseSwotLRL3, SwotPhases
from fsspec.implementations.ftp import FTPFileSystem

fs = FTPFileSystem('ftp-access.aviso.altimetry.fr', 21, username='****', password='****')
db = NetcdfFilesDatabaseSwotLRL3('/swot_products/l3_karin_nadir/l3_lr_ssh/', fs=fs,
                                 enable_layouts=True)
db.query(subset='Basic', cycle_number=2, bbox=(181, 50, 182, 51), version='3.0')

Both old and new version (prior/after pyinterp migration) finds the same half orbits and return the same dataset: