Merge branch '6.0' into 6.1

* 6.0:
  [HttpKernel] lock when writting profiles
  Using identical comparison for path validation
  [Mime] Fix email rendering when having inlined parts that are not related to the content
  fix typo
  [HttpFoundation] move flushing outside of Response::closeOutputBuffers
  [FrameworkBundle] Do not throw when describing a factory definition
  Fix checking result of DateTime::getLastErrors
  [WebProfilerBundle] Fix profile search bar link query params

Attribute/When.php

@@ -12,7 +12,7 @@
 namespace Symfony\Component\DependencyInjection\Attribute;
 
 /**
- * An attribute to tell under which environement this class should be registered as a service.
+ * An attribute to tell under which environment this class should be registered as a service.
  *
  * @author Nicolas Grekas <p@tchwork.com>
  */