Merge branch '6.4' into 7.0

* 6.4:
  [Mime] Fix lowest versions of deps
  [VarDumper] Fix calling scope detection inside magic accessors
  [Validator] add missing German translations
  fix deprecation versions
  update the Brevo SMTP host
  Remove \ReflectionProperty::setAccessible(true) calls
  [Serializer] Fix denormalizing abstract part headers in MimeMessageNormalizer
  Fix property must not be accessed before initialization on SymfonyRuntime::$input
  [Form] Remove an obsolete phpdoc comment
  [Webhook] Allow slash in webhook type
  Use more "First class callable syntax" + Normalize set_error_handler/set_exception_handler calls
  [FrameworkBundle][Workflow] Throw exception is workflow.xxx.transitions is not an array

FormTypeGuesserInterface.php

@@ -33,13 +33,6 @@ public function guessMaxLength(string $class, string $property): ?Guess\ValueGue
 
     /**
      * Returns a guess about the field's pattern.
-     *
-     * - When you have a min value, you guess a min length of this min (LOW_CONFIDENCE)
-     * - Then line below, if this value is a float type, this is wrong so you guess null with MEDIUM_CONFIDENCE to override the previous guess.
-     * Example:
-     *  You want a float greater than 5, 4.512313 is not valid but length(4.512314) > length(5)
-     *
-     * @see https://github.com/symfony/symfony/pull/3927
      */
     public function guessPattern(string $class, string $property): ?Guess\ValueGuess;
 }