Fix UTC access for py < 3.11

Author: septatrix

mkosi/archive.py

@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: LGPL-2.1+
 
-import datetime
+import datetime as dt
 import hashlib
 import json
 import os
@@ -78,9 +78,9 @@ def make_oci(context: Context, dst: Path) -> None:
     layer_archive.rename(ca_store / layer_digest)
 
     creation_time = (
-        datetime.datetime.fromtimestamp(context.config.source_date_epoch, tz=datetime.UTC)
+        dt.datetime.fromtimestamp(context.config.source_date_epoch, tz=dt.timezone.UTC)
         if context.config.source_date_epoch
-        else datetime.datetime.now(tz=datetime.UTC)
+        else dt.datetime.now(tz=dt.timezone.UTC)
     ).isoformat(timespec="seconds")
 
     oci_config = {