fix: updated attribute order in description section class

[fredrik-sjoholm-helo]

Blocket changed the order of the attributes in the section tags for the description field.

Before:
<section class="border-t pt-40 mt-40">
Now:
<section class="pt-40 border-t mt-40">

This fix changes the _extract_description method to reflect this change.

[dunderrrrrr]

Thanks for the PR, much appreciated! Looks good 👍

In the best of worlds we should make it so that css classes etc. does not break parts of this package.

[tim-flynn]

In the best of worlds, API wrappers like this wouldn't be needed...

Really appreciate you keeping this project up to date! It's awesome! 🙌