Out of range since emacs 28

The following line seems to be the culprit with an out of range error when running `ocp-indent-buffer`:

https://github.com/OCamlPro/ocp-indent/blob/7c4d434132cebc15a8213c8be9e7323692eb0a2b/tools/ocp-indent.el#L139

A fix that seems to work for me is:

```
(ocp-indent-region 1 (buffer-size))
```