[neon/qt6/qt6-3d/Neon/release] debian/upstream: Revert "fake signing-key.asc"

[Carlos De Maine]

Git commit e71d1b9c270b66497bb19451bd0ffdf66c3c0ca2 by Carlos De Maine.
Committed on 09/01/2025 at 12:10.
Pushed by carlosdem into branch 'Neon/release'.

Revert "fake signing-key.asc"

This reverts commit 22e067f7b309ef2c3bb626709690ee5d89287410

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

https://invent.kde.org/neon/qt6/qt6-3d/-/commit/e71d1b9c270b66497bb19451bd0ffdf66c3c0ca2

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