[neon/qt6/pyside6/Neon/release] debian/upstream: Revert "fake signing-key.asc to make tooling happy"

[Carlos De Maine]

Git commit 16d1fd9a0af5a5d1cbb3598b69628b20a390635f by Carlos De Maine.
Committed on 09/01/2025 at 12:09.
Pushed by carlosdem into branch 'Neon/release'.

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

This reverts commit 12206449ed6ede58415b83b16f825d057f9d733b

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

https://invent.kde.org/neon/qt6/pyside6/-/commit/16d1fd9a0af5a5d1cbb3598b69628b20a390635f

diff --git a/debian/upstream/signing-key.asc b/debian/upstream/signing-key.asc
deleted file mode 100644
index e69de29b..00000000