[neon/qt6/qt6-graphs/Neon/release] debian/upstream: Revert "fake signing-key.asc"

[Carlos De Maine]

Git commit 203628a5b5906581419668875c7d5e1465a9b005 by Carlos De Maine.
Committed on 09/01/2025 at 12:22.
Pushed by carlosdem into branch 'Neon/release'.

Revert "fake signing-key.asc"

This reverts commit aa0093e280731881a20c79754304674b1e585d9e

D  +0    -0    debian/upstream/signing-key.asc

https://invent.kde.org/neon/qt6/qt6-graphs/-/commit/203628a5b5906581419668875c7d5e1465a9b005

diff --git a/debian/upstream/signing-key.asc b/debian/upstream/signing-key.asc
deleted file mode 100644
index e69de29..0000000