Fixed typo in upgrade step (senaite#2126)

Author: ramonski

src/senaite/core/upgrade/v02_03_000.py

@@ -387,7 +387,7 @@ def migrate_uncertainty_field_to_string(obj):
     if isinstance(value, tuple):
         migrated_value = fixed_point_value_to_string(value, 10)
         logger.info("Migrating Uncertainty field of %s: %s -> %s" % (
-            api.get_pat(obj), value, migrated_value))
+            api.get_path(obj), value, migrated_value))
         value = migrated_value
 
     # set the new value