Replace import-tarballs by pristine-lfs import-dsc

Since pristine-lfs can import tarballs automatically, we should
not use a separate but different implementation of the same
functionality.

Signed-off-by: Andrej Shadura <andrew.shadura@collabora.co.uk>

package-source-builder/overlay/usr/bin/apertis-pkg-pull-updates

@@ -247,7 +247,7 @@ def main():
             prepare_target_branch(upstream_suite, suite)
             import_sources(local_dsc, suite)
             if (local_version.upstream_version != remote_version.upstream_version) and (remote_version.debian_revision is not None):
-                run(['import-tarballs', local_dsc])
+                run(['pristine-lfs', 'import-dsc', local_dsc])
 
 if __name__ == '__main__':
   main()