Fix: Change sqlite to SQL in query checker prompt

In the `sqlAgent`, the `query-checker` step currently references `sqlite` specifically in the prompt, which is incorrect since the `sqlAgent` can interact with multiple types of databases. To make this prompt more accurate and applicable to various SQL databases, I have replaced `sqlite` with `SQL`.

langchain/src/tools/sql.ts

@@ -156,7 +156,7 @@ export class QueryCheckerTool extends Tool {
 
   template = `
     {query}
-Double check the sqlite query above for common mistakes, including:
+Double check the SQL query above for common mistakes, including:
 - Using NOT IN with NULL values
 - Using UNION when UNION ALL should have been used
 - Using BETWEEN for exclusive ranges