Geometry Nodes: increase threshold to make regression tests pass

The real fix here is to use some kind of relative error in `customdata_compare`
instead of the absolute error used now. If vertex coordinates get larger in magnitude,
the allowed error should increase as well.

tests/python/geo_node_test.py

@@ -25,7 +25,7 @@ import sys
 sys.path.append(os.path.dirname(os.path.realpath(__file__)))
 from modules.mesh_test import BlendFileTest
 
-geo_node_test = BlendFileTest("test_object", "expected_object")
+geo_node_test = BlendFileTest("test_object", "expected_object", threshold=1e-4)
 result = geo_node_test.run_test()
 
 # Telling `ctest` about the failed test by raising Exception.