Unlock numpy after dropping 3.8

docs/samples/python/csv_sample_data/test_structured.csv

@@ -1,4 +1,4 @@
-id,name,email,street,city,state,postal_code
-1,John Doe,john.doe@example.com,123 Main St,Anytown,CA,12345
-2,Jane Smith,jane.smith@example.com,456 Elm St,Somewhere,TX,67890
-3,Alice Johnson,alice.johnson@example.com,789 Pine St,Elsewhere,NY,11223
+id,name,email,street,city,state,non_pii
+1,John Doe,john.doe@example.com,123 Main St,Anytown,CA,reallynotpii
+2,Jane Smith,jane.smith@example.com,456 Elm St,Somewhere,TX,reallynotapii
+3,Alice Johnson,alice.johnson@example.com,789 Pine St,Elsewhere,NY,reallynotapiiatall