Merge branch '7.4' into 8.1

* commit '59ef6cf0a4d':
  [TypeInfo] Fix printing array shape keys that contain quotes or backslashes
  [HttpKernel] Fix the log level of exceptions mapped to an HTTP status code
  [HtmlSanitizer] Don't render comments as elements when the default action is `Allow`
  [HtmlSanitizer] Fix `sanitizeFor()` with table-related, `image` and `plaintext` contexts
  [Serializer][Validator] Fix compile-time discovery of attributes on non-public members
  [Serializer] Fix the cache key of MetadataAwareNameConverter when the context can't be serialized
  [TypeInfo] Fix quoted strings resolution with phpstan/phpdoc-parser 1.x
  [TypeInfo] Fix `accepts()` of union and intersection types
  [TypeInfo] Fix `Type::traverse()` PHPDoc
  [Translation] Updating and improving Albanian translations
  [Validator] Review Arabic translations
  [FrameworkBundle] Disable HTTP/2 push on the default HTTP client
  [JsonStreamer] Fix generic types replacement in array shapes
  [Validator] Review Albanian translations

# Conflicts:
#	src/Symfony/Component/JsonStreamer/composer.json