[3.15] gh-149231: tomllib: Limit the number of parts in a key (GH-149233) (GH-149677)

(cherry picked from commit bc7c102f3462a9f014f3ac2546acfb471b2a7eae)

Co-authored-by: Petr Viktorin <encukou@gmail.com>
Co-authored-by: Stan Ulbrych <stan@python.org>

diff --git a/Misc/NEWS.d/next/Library/2026-05-01-16-45-31.gh-issue-149231.x2nBEE.rst b/Misc/NEWS.d/next/Library/2026-05-01-16-45-31.gh-issue-149231.x2nBEE.rst
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+In :mod:`tomllib`, the number of parts in TOML keys is now limited.