[PostGIS] #5877: SFCGAL 2.0 tests show sfcgal_geometry_collection_num_geometries is deprecated

[PostGIS]

#5877: SFCGAL 2.0 tests show sfcgal_geometry_collection_num_geometries is
deprecated
---------------------+-----------------------------
 Reporter:  robe     |      Owner:  Loïc Bartoletti
     Type:  defect   |     Status:  new
 Priority:  blocker  |  Milestone:  PostGIS 3.5.3
Component:  sfcgal   |    Version:  3.4.x
 Keywords:           |
---------------------+-----------------------------
 lwgeom_sfcgal.c:378:17: error: 'sfcgal_geometry_collection_num_geometries'
 is deprecated: Use sfcgal_geometry_num_geometries instead. [-Werror
 =deprecated-declarations]

 https://github.com/postgis/postgis/actions/runs/14318519339/job/40130139805#step:4:556
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5877>
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