Fixed Syntax Error in Trino dialect (#399)

### 🐞 Bug Fix: Trino Schema Selection

**Issue:**  
`connection.exec_driver_sql()` was using a parameterized `USE ?`
statement for Trino, which caused schema selection to fail.
Trino does not support parameter placeholders for schema commands.

**Fix:**  
Replaced the parameterized query with an f-string formatted command to
directly include the schema name.

```python
# Before
connection.exec_driver_sql(
    "USE ?",
    (self._schema,),
)

# After
connection.exec_driver_sql(
    f"USE {self._schema}",
    execution_options=execution_options,
)

Co-authored-by: Mason Daugherty <[email protected]>

Author: 2 people

libs/community/langchain_community/utilities/sql_database.py

@@ -500,8 +500,7 @@ def _execute(
                     pass
                 elif self.dialect == "trino":
                     connection.exec_driver_sql(
-                        "USE ?",
-                        (self._schema,),
+                        f"USE {self._schema}",
                         execution_options=execution_options,
                     )
                 elif self.dialect == "duckdb":