title: Symfony doctrine charset issue
body: <p>I'm trying to learn <code>symfony</code> and working by various examples. The main problem is that I don't really know how to configure <code>doctrine.yaml</code>.</p>
  
  <p>I'm using <code>SQLSRV</code></p>
  
  <p>When I load <code>php bin/console doctrine:fixtures:load --append</code>
  error appears:
  <code>SQLSTATE [IMSSP, -48]: The encoding 'utf8' is not a supported encoding for the CharacterSet connection option.</code></p>
  
  <p>my doctrine configuration is:</p>
  
  <pre><code>doctrine:
      dbal:
          # configure these for your database server
          driver: 'pdo_sqlsrv'
          charset: utf8
          default_table_options:
              charset: utf8
              collate: utf8_general_ci
  
          url: '%env(resolve:DATABASE_URL)%'
      orm:
          auto_generate_proxy_classes: true
          naming_strategy: doctrine.orm.naming_strategy.underscore
          auto_mapping: true
          mappings:
              App:
                  is_bundle: false
                  type: annotation
                  dir: '%kernel.project_dir%/src/Entity'
                  prefix: 'App\Entity'
                  alias: App
  </code></pre>
  
  <p>also I tried default configuration:</p>
  
  <pre><code> charset: utf8mb4
      default_table_options:
          charset: utf8mb4
          collate: utf8mb4_unicode_ci
  </code></pre>