fix(postcodes/CA): null bogus 90/0 coords on H0H (Santa Claus FSA)

H0H is a real Canadian FSA reserved by Canada Post for letters to
Santa Claus at the North Pole. The source dataset has no real lat/lng
for it; the importer fell through to (90, 0) which trips the geo-
bounds validator. Null the coordinates instead of dropping the row,
so the FSA stays queryable.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: dr5hn

contributions/postcodes/CA.json

@@ -4446,8 +4446,8 @@
     "state_id": 873,
     "state_code": "QC",
     "locality_name": "Reserved (Santa Claus)",
-    "latitude": "90",
-    "longitude": "0",
+    "latitude": null,
+    "longitude": null,
     "type": "fsa",
     "source": "statscan-fsa-via-inkjet"
   },