Use rector downgrade php (#2582)

* Require rector-downgrade-php

* test

* update

* temporary require rector/rector-downgrade-php on package test

* tweak

* easy-ci fix

* fix

* try with remove --no-update

* Revert try with remove --no-update

This reverts commit 2257be6.

* regenerate docs

* try tweak

.github/workflows/packages_tests.yaml

@@ -28,6 +28,7 @@ jobs:
                     - rectorphp/rector-nette
                     - rectorphp/rector-cakephp
                     - rectorphp/rector-phpoffice
+                    - rectorphp/rector-downgrade-php
 
         steps:
             # see https://github.com/actions/checkout#usage
@@ -48,7 +49,11 @@ jobs:
             # test with current commit in a pull-request
             -
                 run: composer require rector/rector-src dev-main#${{github.event.pull_request.head.sha}} --no-update
-                if: ${{ github.event_name == 'pull_request' }}
+                if: ${{ github.event_name == 'pull_request' && matrix.repository_name != 'rectorphp/rector-downgrade-php' }}
+
+            -
+                run: composer require rector/rector-downgrade-php:dev-main --no-update
+                if: ${{ matrix.repository_name != 'rectorphp/rector-downgrade-php' }}
 
             -   run: composer install --ansi