[neon/qt6/qt6-quick3d/Neon/release] debian/upstream: Revert "fake signing-key.asc"

[Carlos De Maine]

Git commit 418c8ebbe66fccf5103fc2cc66ccbd0f5debda49 by Carlos De Maine.
Committed on 09/01/2025 at 12:31.
Pushed by carlosdem into branch 'Neon/release'.

Revert "fake signing-key.asc"

This reverts commit d3d35cea5db0748e58d1a34425ff9e568c3ab75f

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

https://invent.kde.org/neon/qt6/qt6-quick3d/-/commit/418c8ebbe66fccf5103fc2cc66ccbd0f5debda49

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