use downgrade config without version

Author: TomasVotruba

.github/workflows/downgraded_release.yaml

@@ -34,7 +34,7 @@ jobs:
             -   run: composer require rector/rector:^0.17.1 --working-dir rector-local --ansi
 
             # downgrade to PHP 7.4
-            -   run: rector-local/vendor/bin/rector process src config --config build/rector-downgrade-php-74.php --ansi
+            -   run: rector-local/vendor/bin/rector process src config --config build/rector-downgrade-php.php --ansi
 
             # clear the dev files
             -   run: rm -rf tests rector-local ecs.php phpstan.neon phpunit.xml .editorconfig

build/rector-downgrade-php-74.php build/rector-downgrade-php.phpbuild/rector-downgrade-php-74.php renamed to build/rector-downgrade-php.php

@@ -12,4 +12,4 @@ rm -rf tests
 # downgrade with rector
 mkdir rector-local
 composer require rector/rector --working-dir rector-local
-rector-local/vendor/bin/rector process bin src vendor --config build/rector-downgrade-php-72.php --ansi
+rector-local/vendor/bin/rector process bin src vendor --config build/rector-downgrade-php.php --ansi