Change licesnse to GPL-2.0

Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>

linux-git-pull

diff --git a/linux-git-pull b/linux-git-pull
index 35e76c7..722f394 100755
--- a/linux-git-pull
+++ b/linux-git-pull
@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-# SPDX-License-Identifier: GPL-3.0-or-later
+# SPDX-License-Identifier: GPL-2.0-or-later
 # Copyright (c) Jarkko Sakkinen 2025
 
 set -e