Merge pull request #5142 from kylebarron/patch-1

`duckdb.default_connection` changed from attribute to function in duckdb 1.2

Author: szarnyasg

docs/stable/clients/python/dbapi.md

@@ -51,7 +51,7 @@ duckdb.execute("CREATE TABLE tbl AS SELECT 42 a")
 con = duckdb.connect(":default:")
 con.sql("SELECT * FROM tbl")
 # or
-duckdb.default_connection.sql("SELECT * FROM tbl")
+duckdb.default_connection().sql("SELECT * FROM tbl")
 ```
 
 ```text