[hugovk]

Doctest builds on 3.11 have started failing:

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Run sudo ./.github/workflows/posix-deps-apt.sh && sudo apt-get install wamerican
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Reading package lists...
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E: Unable to locate package lzma-dev

• https://github.com/python/cpython/actions/runs/42555143736/job/129087544426?pr=161030
• [3.11] gh-160506: Fix ntpath.realpath() for broken links via directory links (GH-160507) #161030
• [3.11] gh-161192: Update bundled Expat to 2.10.0 (GH-161202) #161266
• [3.11] gh-161323: Refuse drive-relative paths in tarfile extraction filters (GH-161334) #161359
• [3.11] gh-161569: Check cookie policy before deleting expired cookies in http.cookiejar (GH-161570) #161583

This is because ubuntu-latest is used, and that now points to 26.04, which no longer has the lzma-dev package.

3.12+ was already pinned to ubuntu-22.04 (#125236) and upgraded to ubuntu-24.04 (#128504).

(3.14+ have also been upgraded to ubuntu-26.04 (#152717).)

So the easiest thing to do here is pin to ubuntu-24.04, like 3.12 and 3.13.

This PR also includes some other minor changes, to make it more similar to the 3.12 file, and easier to compare/maintain in the future.

• Issue: Upgrade doctest CI to Ubuntu-24.04 #128504