restrict range for interpolated housenumbers

Interpolations are only supported up to 2^32 by the database.
Limit to 8 digits, which is still more than should be needed.

nominatim/api/search/db_searches.py

@@ -685,7 +685,8 @@ class PlaceSearch(AbstractSearch):
             if self.qualifiers:
                 place_sql = place_sql.where(self.qualifiers.sql_restrict(thnr))
 
-            numerals = [int(n) for n in self.housenumbers.values if n.isdigit()]
+            numerals = [int(n) for n in self.housenumbers.values
+                        if n.isdigit() and len(n) < 8]
             interpol_sql: SaColumn
             tiger_sql: SaColumn
             if numerals and \