Fixed timezone being returned incorrectly

Happened if you've set TZ to non-UTC.

Apparently astimezone and replace doesn't do the same thing even if tzinfo is None.

tests_integration/docker-compose-cockroachdb.yml

@@ -6,6 +6,7 @@ services:
     environment:
       - COCKROACH_USER=john
       - COCKROACH_DATABASE=spoolman
+      - TZ=Asia/Seoul
     healthcheck:
       test:
         [
@@ -26,6 +27,7 @@ services:
       - SPOOLMAN_DB_NAME=spoolman
       - SPOOLMAN_DB_USERNAME=john
       - SPOOLMAN_LOGGING_LEVEL=INFO
+      - TZ=Europe/Stockholm
     depends_on:
       db:
         condition: service_healthy