Fix incompatibility with v1.3.0

Should fix the bug reported in: kristeligt-dagblad#40 as it's the recommended fix, but it should be checked.

macros/hooks/model_audit.sql

@@ -3,7 +3,7 @@
 {% do return ({
     'model': 'string',
     'schema': 'string',
-    'created_at': dbt_utils.type_timestamp(),
+    'created_at': type_timestamp(),
     'training_info': 'array<struct<training_run int64, iteration int64, loss float64, eval_loss float64, learning_rate float64, duration_ms int64, cluster_info array<struct<centroid_id int64, cluster_radius float64, cluster_size int64>>>>',
     'feature_info': 'array<struct<input string, min float64, max float64, mean float64, median float64, stddev float64, category_count int64, null_count int64>>',
     'weights': 'array<struct<processed_input string, weight float64, category_weights array<struct<category string, weight float64>>>>',