osbuild: run isort on all files

assemblers/org.osbuild.qemu

@@ -28,12 +28,11 @@ import struct
 import subprocess
 import sys
 import tempfile
-from typing import List, BinaryIO, Optional
+from typing import BinaryIO, List, Optional
 
 import osbuild.api
 import osbuild.remoteloop as remoteloop
 
-
 SCHEMA = """
 "additionalProperties": false,
 "required": ["format", "filename", "ptuuid", "size"],