remove postal code length sanitization from the request

[OlfatProgressus]

All Submissions:

• Does your code follow WooCommerce and WordPress standards?
• Have you successfully run tests with your changes locally?
• Have you tested both blocks/non-blocks cart/checkout?
• Have you tested the cart and checkout as both a logged-in user and a guest?
• Have you successfully placed an order as both a logged-in user and a guest?
• Did you have the query monitor plugin active during all testing?

Changes proposed in this Pull Request:

Closes # .

The fix is related to this support ticket

How to test the changes in this Pull Request:

1. Create an order with Portugal shipping address
2. Create label for this order
3. Check the postal code in the label if it full or only the first 6 digits

Other information:

• Have you checked to ensure there aren't other open Pull Requests for the same update/change?