06 queryer examples covid Segmentation fault

OS: Windows 10
cargo 1.76.0 (c84b36747 2024-01-18)


```
Running `D:\src\geektime-rust\target\debug\examples\covid.exe`
DataSet(shape: (0, 5)
error: process didn't exit successfully: `D:\src\geektime-rust\target\debug\examples\covid.exe` (exit code: 0xc0000005, STATUS_ACCESS_VIOLATION)
Segmentation fault
```

downgrade rust to 1.75.0 or upgrade polars to 0.37.0 fix the issue