Fix import ordering for Jenkins lint

mandelstudio/admin_fixes.py

@@ -8,8 +8,10 @@ def patch_invoice_admin():
     date_hierarchy setting injected by the communications plugin.
     """
     try:
-        import oscar_invoices.admin  # noqa: F401
         from oscar.core.loading import get_model
+
+        import oscar_invoices.admin  # noqa: F401
+
         from ocyan.plugin.oscar_communications.oscar_invoices_extension.admin import (
             InvoiceAdmin,
         )