[Python] Arrow converts pandas Timedeltas with time unit 'ms' or higher to 0

### Describe the bug, including details regarding any error messages, version, and platform.

```python
>>> pa.Array.from_pandas(pd.Series([pd.Timedelta(np.timedelta64(1, 'ms'))], dtype=object))

[
0
]
```

The number `1` doesn't matter, but the time unit has to be `'ms'` or larger and the dtype has to be `object` to trigger the error.

The same error can be triggered more simply via:

```python
>>> pa.array([pd.Timedelta(np.timedelta64(1, 'ms'))])

[
0
]
```

### Component(s)

Python