Use dynamic symfony/yaml version on windows

Author: simPod

.github/workflows/php.yml

@@ -76,7 +76,7 @@ jobs:
         if: matrix.os == 'windows-latest'
         run: |
           composer install --prefer-dist --no-interaction --no-progress --ansi
-          composer require symfony/yaml:5.1.8 --prefer-dist --no-interaction --ansi
+          composer require symfony/yaml:"${YAML}" --prefer-dist --no-interaction --ansi
 
       - name: Validate test data
         if: matrix.os == 'ubuntu-latest'