Symfony 5.3.6 released

Symfony 5.3.6 has just been released. Here is a list of the most important changes: bug #42307 [Mailer] Fixed decode exception when sendgrid response is 202 (@rubanooo) bug #42296 [Dotenv][Yaml] Remove PHP 8.0 polyfill (@derrabus) bug #42274 [VarDumper] HtmlDumper::setDumpHeader() accepts null (@rrpadilla) bug #42289 [HttpFoundation] Fixed type mismatch (@Toflar) bug #42259 [Security]
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