Change GH action path to always take current version

[LecrisUT]

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:books: Documentation preview :books:: https://readthedocs-preview--28.org.readthedocs.build/en/28/

[LecrisUT]

Hmm for some reason this doesn't work. I suspect it's because of:

on:
  pull_request_target:
    types:
      - opened

So that it still runs the version on main.

Edit: Indeed that was the case. Changing it on: pull_request fixes that.