Pre-commit: prevent spaces in news entry paths

[hugovk]

Follow on to python/core-workflow#186 and https://discuss.python.org/t/new-blurb-1-2-please-upgrade/59159:

At some future point, we may trigger an error on the CI if a news file is found in a directory with spaces, so please do upgrade your blurb now.

When it fails, it tells you what to do, for example:

Check Core and Builtins news entries.....................................Failed
- hook id: blurb-no-space-core-and-builtins
- exit code: 1

Space found in path, move to Misc/NEWS.d/next/Core_and_Builtins/

Misc/NEWS.d/next/Core and Builtins/2023-12-30-00-21-45.gh-issue-113570._XQgsW.rst
Misc/NEWS.d/next/Core and Builtins/2024-05-12-03-10-36.gh-issue-118950.5Wc4vp.rst
Misc/NEWS.d/next/Core and Builtins/2024-10-18-10-11-43.gh-issue-125593.Q97m3A.rst
Misc/NEWS.d/next/Core and Builtins/2024-10-26-13-32-48.gh-issue-126012.2KalhG.rst

https://github.com/python/cpython/actions/runs/11548867437/job/32140948311?pr=126063

We may get some old PRs merged that don't have the check, but it will be easy to cleanup later. And we often update old PRs from main to re-trigger the CI and see the warning before merge.

---

Thanks to @adamchainz for https://adamj.eu/tech/2024/01/24/pre-commit-fail-hook/

[AlexWaygood]

Nice, TIL!