Add support for PostGIS 3.5

[David Smith]

​PostGIS 3.5 was released on 26 September 2024.

My initial try showed that there is one test failure when using this new version that needs to be investigated.

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ERROR: test_relate_lookup (gis_tests.geoapp.tests.GeoLookupTest.test_relate_lookup)
Testing the 'relate' lookup type.
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Traceback (most recent call last):
  File "C:\Users\smith\projects\django\tests\gis_tests\geoapp\tests.py", line 581, in test_relate_lookup
    "Lawrence", City.objects.get(point__relate=(ks.poly, within_mask)).name
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\smith\projects\django\django\db\models\manager.py", line 87, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\smith\projects\django\django\db\models\query.py", line 633, in get
    raise self.model.DoesNotExist(
gis_tests.geoapp.models.City.DoesNotExist: City matching query does not exist.