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

[Carlos De Maine]

Git commit 7a190ac365f227f46fac786f29faf7f10bd6a666 by Carlos De Maine.
Committed on 09/01/2025 at 12:22.
Pushed by carlosdem into branch 'Neon/release'.

Revert "fake signing-key.asc"

This reverts commit 4d1dc57cbe188c03e3811ac368dfe6ee9e32bc1d

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

https://invent.kde.org/neon/qt6/qt6-grpc/-/commit/7a190ac365f227f46fac786f29faf7f10bd6a666

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