bin/gen_release_notes.py: fix commit list command

Fixes: 86079447da1e00d49db0 ("scripts: Add a gen_release_notes.py script")
Signed-off-by: Eric Engestrom <eric@engestrom.ch>
Reviewed-by: Dylan Baker <dylan@pnwbakers.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4069>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4069>
1 file changed