Optimise `pathlib.Path.relative_to()`

# Feature or enhancement

### Proposal:

`pathlib.Path.relative_to()` can be significantly optimised by making use of `itertools.chain`

### Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

### Links to previous discussion of this feature:

_No response_


### Linked PRs
* gh-112406