tools/mpp: sort import

Makes David happy, which makes us happy.

tools/osbuild-mpp

@@ -154,21 +154,21 @@ Example:
 
 
 import argparse
+import collections
 import contextlib
 import json
 import os
+import pathlib
 import string
 import subprocess
 import sys
-import pathlib
 import tempfile
 import urllib.parse
-import collections
+from typing import Dict, Optional
+
 import dnf
 import hawkey
 
-from typing import Dict, Optional
-
 from osbuild.util.rhsm import Subscriptions