v6.2.4

Remove fiona from utils_gis, replace with pyogrio (trans-dependency of geopandas)
Add test for gis utils
Test with base image netboxcommunity/netbox:v4.6.0
Replace libgdal34/libgeos-c1t64/libproj25 system packages with libgdal38
(Ubuntu 26.04 renamed GDAL; shapely/pyproj ship bundled native libs)
Remove fiona, geopandas, shapely, pyproj, rtree, psycopg2-binary from
plugin_requirements.txt — fiona replaced by pyogrio (geopandas transitive
dep), others are either unused or installed separately in the Dockerfile
Remove geocoder and python-slugify (unused)