Revert "Avoid error lexing multiprocessing docs code block on Pygments 2.15.0"

[hugovk]

Pygments 2.15.1 has been released fixing the error that required GH-103421.

• https://github.com/pygments/pygments/releases/tag/2.15.1
• Traceback parsing changes in 2.15.0 error on valid pycon code blocks pygments/pygments#2407 (comment)

This therefore reverts GH-103421.

Only needs backporting to 3.11 because the backports of the original only went that far.

We can therefore closes the other original, unmerged backports:

• Closes [3.10] Doc: Avoid error lexing multiprocessing docs code block on Pygments 2.15.0 (GH-103421) #103428 (3.10)
• Closes [3.9] Doc: Avoid error lexing multiprocessing docs code block on Pygments 2.15.0 (GH-103421) #103429 (3.9)
• Closes [3.8] Doc: Avoid error lexing multiprocessing docs code block on Pygments 2.15.0 (GH-103421) #103430 (3.8)
• Closes [3.7] Doc: Avoid error lexing multiprocessing docs code block on Pygments 2.15.0 (GH-103421) #103431 (3.7)

[AlexWaygood]

Would it maybe be worth pinning Pygments to >=2.15.1?

[hugovk]

It's not a direct dependency, or we could have done Pygments != 2.15.0 in the first place.

[miss-islington]

Thanks @hugovk for the PR 🌮🎉.. I'm working now to backport this PR to: 3.11.
🐍🍒⛏🤖

[bedevere-bot]

GH-103695 is a backport of this pull request to the 3.11 branch.

[CAM-Gerlach]

Would it maybe be worth pinning Pygments to >=2.15.1?

(For others' reference, this was done in #103860 )