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

[Carlos De Maine]

Git commit 7ee78621e744dbcae502a5aa7ea7597ecaa68e2d by Carlos De Maine.
Committed on 09/01/2025 at 12:20.
Pushed by carlosdem into branch 'Neon/release'.

Revert "fake signing-key.asc"

This reverts commit 7e0eb79377278c10738e4218607a22d4049b9147

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

https://invent.kde.org/neon/qt6/qt6-doc/-/commit/7ee78621e744dbcae502a5aa7ea7597ecaa68e2d

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