topsql metric timeout is too low

The topsql query seems to take longer than 5s in many cases.  probably needs a slightly longer timeout.

This error is seen in log:

```
time=2025-06-17T17:50:34.463Z level=ERROR source=collector.go:258 msg="Error scraping metric" Context=top_sql MetricsDesc="map[elapsed:SQL statement elapsed time running]" duration=5.004617326s error="Oracle query timed out" database=default
```