3.10: GHA Docs builds of PRs fail because they use removed actions/upload-artifact: v3

[encukou]

3.10 & 3.9 PRs fail on documentation builds with:

Error: This request has been automatically failed because it uses a deprecated version of actions/upload-artifact: v3. Learn more: https://github.blog/changelog/2024-04-16-deprecation-notice-v3-of-the-artifact-actions/

For example: https://github.com/python/cpython/actions/runs/13077929192/job/36494533879?pr=129529

Linked PRs

• [3.10] gh-129641: Docs GHA build: use upload-artifact@v4 & Python 3.12 #129642
• [3.9] gh-129641: Docs GHA build: use upload-artifact@v4 (GH-129642) #130114

[encukou]

Note that for newer branches, docs builds were switched to Netlify (in #100330) and then Read the Docs; we no longer use upload-artifact there.
3.10 and 3.9 have a stub Read the Docs config file that disables the builds there (which currently fails, see #129509).

[StanFromIreland]

3.9 currently builds cpython from source like so

    - name: 'Configure CPython'
      run: ./configure --with-pydebug
    - name: 'Build CPython'
      run: make -j4

but I it builds from the 3.9 branch it checks out so there is no need to change anything.

There is still actions/upload-artifact@v3 to be updated. I can do it for you if you are busy.

3.9 example.

[encukou]

Thanks! I already had the 3.9 PR half-done when I saw your message.