fix: use IntegerField for run_interval migration

Signed-off-by: Keshav Priyadarshi <git@keshav.space>

Author: keshav-space

vulnerabilities/migrations/0137_alter_pipelineschedule_run_interval.py

@@ -26,7 +26,7 @@ def revert_convert_hours_to_minutes(apps, schema_editor):
         migrations.AlterField(
             model_name="pipelineschedule",
             name="run_interval",
-            field=models.PositiveSmallIntegerField(
+            field=models.IntegerField(
                 default=1440,
                 help_text="Number of minutes to wait between run of this pipeline.",
                 validators=[