[neon/qt6/qt6-wayland/Neon/release] debian/upstream: Revert "fake signing-key.asc to make tooling happy"

[Carlos De Maine]

Git commit 0d356e3baa727ff2bc8f4a5ea308a86e226ee311 by Carlos De Maine.
Committed on 09/01/2025 at 12:40.
Pushed by carlosdem into branch 'Neon/release'.

Revert "fake signing-key.asc to make tooling happy"

This reverts commit 8000d205e710b04937910531f89ebe6e2813d140

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

https://invent.kde.org/neon/qt6/qt6-wayland/-/commit/0d356e3baa727ff2bc8f4a5ea308a86e226ee311

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