Python 3.13 release, please?

### Checklist

- [x] I have searched for [similar issues](https://github.com/isl-org/Open3D/issues).
- [x] For Python issues, I have tested with the [latest development wheel](https://www.open3d.org/docs/latest/getting_started.html#development-version-pip).
- [x] I have checked the [release documentation](https://www.open3d.org/docs/release/) and the [latest documentation](https://www.open3d.org/docs/latest/) (for `main` branch).

### Proposed new feature or change

Python 3.12 has now gone into "security fix only" mode, so the latest release for which binary installers are available is 3.12.10.

I have a package that depends on Open3D and Python (and many many other things), but this means that for my binary installer for Windows I now have to include an outdated version of Python (or at least tell the end user to install an outdated version of Python).

Is there a timeline for when Open3D will support Python 3.13?

### References

_No response_

### Additional information

_No response_