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

[Carlos De Maine]

Git commit 8fd750c914aa9a424bc62b745571fdd380930653 by Carlos De Maine.
Committed on 09/01/2025 at 12:30.
Pushed by carlosdem into branch 'Neon/release'.

Revert "fake signng-key.asc"

This reverts commit e1a98ac74379fd783e22cd8fbc8b359f9407c9a7

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

https://invent.kde.org/neon/qt6/qt6-opcua/-/commit/8fd750c914aa9a424bc62b745571fdd380930653

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