ruff: Fix DTZ004 `datetime.datetime.utcfromtimestamp()`.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

zerver/lib/compatibility.py

@@ -28,9 +28,9 @@ def is_outdated_server(user_profile: Optional[UserProfile]) -> bool:
     # someone has upgraded in the last year but to a release more than
     # a year old.
     git_version_path = os.path.join(settings.DEPLOY_ROOT, "version.py")
-    release_build_time = datetime.datetime.utcfromtimestamp(
-        os.path.getmtime(git_version_path)
-    ).replace(tzinfo=datetime.timezone.utc)
+    release_build_time = datetime.datetime.fromtimestamp(
+        os.path.getmtime(git_version_path), datetime.timezone.utc
+    )
 
     version_no_newer_than = min(LAST_SERVER_UPGRADE_TIME, release_build_time)
     deadline = version_no_newer_than + datetime.timedelta(

zerver/management/commands/export_search.py

@@ -143,8 +143,8 @@ This is most often used for legal compliance.
         output = {"zerver_message": message_dicts}
         floatify_datetime_fields(output, "zerver_message")
         for item in output["zerver_message"]:
-            item["date_sent_utc"] = datetime.utcfromtimestamp(int(item["date_sent"])).strftime(
-                "%Y-%m-%d %H:%M:%S"
-            )
+            item["date_sent_utc"] = datetime.fromtimestamp(
+                int(item["date_sent"]), timezone.utc
+            ).strftime("%Y-%m-%d %H:%M:%S")
 
         write_table_data(options["output"], output)