Merge branch '7.1' into 7.2

* 7.1: (31 commits)
  [Serializer] Remove useless calls to `func_get_arg()`
  fix tests using Twig 3.12
  skip tests requiring the intl extension if it's not installed
  🐛 throw ParseException on invalid date
  [FrameworkBundle] Re-remove redundant name attribute from `default_context`
  fix permitted data type of the default choice
  [ExpressionLanguage] Improve test coverage
  Fix invalid phpdoc in ContainerBuilder
  [HttpKernel] [WebProfileBundle] Fix Routing panel for URLs with a colon
  [Form] NumberType: Fix parsing of numbers in exponential notation with negative exponent
  Fix importing PHP config in prepend extension method
  [Messenger] Prevent waiting time to overflow when using long delays
  [Security] consistent singular/plural translation in Dutch
  reset the validation context after validating nested constraints
  do not duplicate directory separators
  fix handling empty data in ValueToDuplicatesTransformer
  fix compatibility with redis extension 6.0.3+
  synchronize unsupported scheme tests
  [String] Fixed Quorum plural, that was inflected to be only "Quora" and never "Quorums"
  Fix symfony/kaz-info-teh-notifier package
  ...