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

[Carlos De Maine]

Git commit a1ef31032bb70667a90adf2917f5dbe94b6a9af2 by Carlos De Maine.
Committed on 09/01/2025 at 12:23.
Pushed by carlosdem into branch 'Neon/release'.

Revert "fake signing-key.asc"

This reverts commit 3f7fe31657d6cb1cc693a3b6dfba6dc0246c71b8

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

https://invent.kde.org/neon/qt6/qt6-imageformats/-/commit/a1ef31032bb70667a90adf2917f5dbe94b6a9af2

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