Hamilton tracker gives an error with datetime columns in polars dataframes

## Reproduction

```python
from datetime import datetime

import polars as pl
from hamilton import driver
from hamilton_sdk import adapters

import __main__ as dag

def df() -> pl.Series:
return pl.Series(
"timestamp",
[
datetime(2021, 1, 1),
datetime(2021, 1, 2),
datetime(2021, 1, 3),
],
)

tracker = adapters.HamiltonTracker(
project_id=1,
username="elyase",
dag_name="polars",
)

dr = driver.Builder().with_modules(dag).with_adapters(tracker).build()
result = dr.execute(["df"])
```

## Stack Traces

```
File "/Users/yaser/Documents/shitcoins/.venv/lib/python3.12/site-packages/hamilton/node.py", line 249, in __call__
return self.callable(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/elyase/test/.venv/lib/python3.12/site-packages/hamilton_sdk/tracking/polars_col_stats.py", line 52, in std
return col.std()
^^^^^^^^^
File "/Users/elyase/test/.venv/lib/python3.12/site-packages/polars/series/series.py", line 2049, in std
return self._s.std(ddof)
^^^^^^^^^^^^^^^^^
polars.exceptions.InvalidOperationError: `std` operation not supported for dtype `datetime[μs]`
```