Cannot access protected property status_code [#3582025]

Problem/Motivation

The source code of HTTPStatusSubscriber needs changes.

Steps to reproduce

When trying to access some URL which is included the http_status_code entity list the code throws:
Error: Cannot access protected property Drupal\http_status_code\Entity\HTTPStatusEntity::$status_code...

Proposed resolution

Refactor HTTPStatusSubscriber by changing: $set_status->status_code to $set_status->get('status_code')

Issue fork http_status_code-3582025

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3582025-cannot-access-protected changes, plain diff MR !11
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