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

[Carlos De Maine]

Git commit 7259dc2ac7329b63517df908519ad2efe9d7ce74 by Carlos De Maine.
Committed on 09/01/2025 at 12:33.
Pushed by carlosdem into branch 'Neon/release'.

Revert "fake signing-key.asc"

This reverts commit f408d0d9c11392c50091abd0501ab2a74b9378b9

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

https://invent.kde.org/neon/qt6/qt6-serialport/-/commit/7259dc2ac7329b63517df908519ad2efe9d7ce74

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