[neon/forks/sip6/Neon/release] /: Update upstream source from tag 'upstream/6.15.0'

[Dmitry Shachnev]

Git commit ad0fab00431341ce4fe1f62e349990259e9296b8 by Dmitry Shachnev.
Committed on 06/12/2025 at 16:44.
Pushed by carlosdem into branch 'Neon/release'.

Update upstream source from tag 'upstream/6.15.0'

Update to upstream version '6.15.0'
with Debian dir 06206517835c2eec1e664c87027faff07ebb489c


https://invent.kde.org/neon/forks/sip6/-/commit/ad0fab00431341ce4fe1f62e349990259e9296b8