1.5.0: Build breaks: error: no member named 'left' in 'duckdb::SetOperationNode'

This extension fails to build for duckdb-1.5.0:
```
/usr/ports/databases/duckdb/work/duckdb-1.5.0/extension/sqlsmith/src/statement_simplifier.cpp:199:16: error: no member named 'left' in 'duckdb::SetOperationNode'
199 | Simplify(node.left);
| ~~~~ ^
/usr/ports/databases/duckdb/work/duckdb-1.5.0/extension/sqlsmith/src/statement_simplifier.cpp:200:16: error: no member named 'right' in 'duckdb::SetOperationNode'
200 | Simplify(node.right);
| ~~~~ ^
/usr/ports/databases/duckdb/work/duckdb-1.5.0/extension/sqlsmith/src/statement_simplifier.cpp:221:31: error: no member named 'left' in 'duckdb::SetOperationNode'
221 | SimplifyReplace(node, setop.left);
| ~~~~~ ^
/usr/ports/databases/duckdb/work/duckdb-1.5.0/extension/sqlsmith/src/statement_simplifier.cpp:222:31: error: no member named 'right' in 'duckdb::SetOperationNode'
222 | SimplifyReplace(node, setop.right);
| ~~~~~ ^
4 errors generated.
```

Rev. e6e6750ceb91e1869b2c736abb70d818bac73e9a