[neon/forks/sip6/Neon/release] /: Update upstream source from tag 'upstream/6.15.1'

[Dmitry Shachnev]

Git commit 8632e093b5be7f8785284bb9f311a86e9a416306 by Dmitry Shachnev.
Committed on 21/12/2025 at 09:10.
Pushed by carlosdem into branch 'Neon/release'.

Update upstream source from tag 'upstream/6.15.1'

Update to upstream version '6.15.1'
with Debian dir f04b631b53655a7c922b3bfefd8edbd0ab91d82b


https://invent.kde.org/neon/forks/sip6/-/commit/8632e093b5be7f8785284bb9f311a86e9a416306