Add type conversion to int, when batch_size is specified via cli

Signed-off-by: Shivam Sandbhor <shivam.sandbhor@gmail.com>

Author: sbs2001

vulnerabilities/management/commands/import.py

@@ -100,7 +100,7 @@ def import_data(self, names, cutoff_date):
     def _import_data(self, importers, cutoff_date):
         for importer in importers:
             self.stdout.write(f'Importing data from {importer.name}')
-            batch_size = getattr(self, 'batch_size', 10)
+            batch_size = int(getattr(self, 'batch_size', 10))
             ImportRunner(importer, batch_size).run(cutoff_date=cutoff_date)
             self.stdout.write(
                 self.style.SUCCESS(f'Successfully imported data from {importer.name}'))