scylla-artifacts.py: Fix incorrect write command
scylla-artifacts.py: Fix incorrect write command

Signed-off-by: Lucas Meneghel Rodrigues <8ad3460456640ab580599f5440c5a8d925a620b9@scylladb.com>

lmr/scylla-artifact-tests,scylladb/scylla-artifact-tests,scylladb/scylla-artifact-tests