[neon/forks/sip6/Neon/release] /: Update upstream source from tag 'upstream/6.15.3'

[Dmitry Shachnev]

Git commit 72a69bfb144e89157baa2487eb0732b4a37c3bc2 by Dmitry Shachnev.
Committed on 24/03/2026 at 12:56.
Pushed by carlosdem into branch 'Neon/release'.

Update upstream source from tag 'upstream/6.15.3'

Update to upstream version '6.15.3'
with Debian dir c6ae244a7e6c6f2321d9953e7088bb040664b1a7


https://invent.kde.org/neon/forks/sip6/-/commit/72a69bfb144e89157baa2487eb0732b4a37c3bc2