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

[Carlos De Maine]

Git commit 13f9ecea4f0e4ef37667594300bb217fb01a9b21 by Carlos De Maine.
Committed on 09/01/2025 at 12:14.
Pushed by carlosdem into branch 'Neon/release'.

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

This reverts commit 390c0128f79b833ae46286adec5860c5726267af

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

https://invent.kde.org/neon/qt6/qt6-base/-/commit/13f9ecea4f0e4ef37667594300bb217fb01a9b21

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