fix windows issue pre-commit
By not explicitly using `python` in the entry, we would get
```
Executable `python3` not found
```
on Windows

xref https://github.com/pandas-dev/pandas/pull/37023#issuecomment-716607730
sure ok. pls merge on green.

are the windows builds still not very stable? any ideas on this.  > pls merge on green.

Sure - merging then (following explicit approval - I wouldn't usually do this)