[damned-lies] Init datetime with timezone in get_lang_files

[Claude Paroz <claudep src gnome org>]

commit 09c3573a19415cc319df8d1fdc0028b3ee5ab7f8
Author: Claude Paroz <claude 2xlibre net>
Date:   Tue Dec 7 18:08:39 2021 +0100

    Init datetime with timezone in get_lang_files

 stats/models.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/stats/models.py b/stats/models.py
index 102d3ff3..7ecc9efa 100644
--- a/stats/models.py
+++ b/stats/models.py
@@ -1280,7 +1280,7 @@ class Release(models.Model):
         po_stats = {f"{st.branch_id}-{st.domain_id}": st
                     for st in Statistics.objects.filter(language=lang, branch__releases=self, 
domain__dtype=dtype)}
         lang_files = []
-        last_modif_date = datetime(1970, 1, 1)
+        last_modif_date = datetime(1970, 1, 1, tzinfo=timezone.utc)
         # Create list of files
         for stat in pot_stats:
             if stat.full_po.updated > last_modif_date: