Symfony 5.4.35 has just been released.
Here is the list of the most important changes since 5.4.34:

bug #52913 [Routing] Fixed priority getting lost when setting localized prefix (@pritasil)
bug #53183 [Messenger] PhpSerializer: TypeError should throw MessageDecodingFailedException (@B-Galati)
bug #53678 [Mime] Fix serializing uninitialized RawMessage::$message to null (@nicolas-grekas)
bug #53634 [Notifer][Smsapi] Set messageId of SentMessage (@tomasz-kusy)
bug #53501 [DependencyInjection] support lazy evaluated exception messages with Xdebug 3 (@xabbuh)
bug #53671 [HttpClient] Fix pausing responses before they start when using curl (@nicolas-grekas)
bug #53663 [TwigBridge] separate child and parent context in NotificationEmail on writes (@xabbuh)
bug #53157 [Mailer] Throw TransportException when unable to read from socket (@xdanik)
bug #53361 [Serializer] Take unnamed variadic parameters into account when denormalizing (@thijsBreker)
bug #53530 [Serializer] Rewrite AbstractObjectNormalizer::createChildContext() to use the provided cache_key from original context when creating child contexts (@amne)
bug #53506 [HttpClient] Fix error chunk creation in passthru (@rmikalkenas)
bug #53357 [Translation] Fix TranslationNodeVisitor with constant domain (@VincentLanglet)
bug #53525 [Messenger] [AMQP] Throw exception on nack callback (@kvrushifa)
bug #53432 [HttpFoundation] Request without content-type or content-length header should result in null values, not empty strings (@priyadi)
bug #53593 [Cache] Fix possible infinite loop in CachePoolPass (@HypeMC)
bug #53588 [Translation] fix multi-byte code area to convert (@xabbuh)
bug #53565 [Mime] Fix undefined array key 0 when empty sender (@0x346e3730)
bug #53516 [Console] Allow ‚0‘ as a $shortcut in InputOption.php (@lawsonjl-ornl)
bug #53576 [Console] Only execute additional checks for color support if the output (@theofidry)
bug #53582 [TwigBundle] Fix configuration when „paths“ is null (@smnandre)
bug #53581 [String] fix aircraft inflection (@renanbr)
bug #53509 [Security] Fix AuthenticationUtils::getLastUsername() returning null (@alexandre-daubois)
bug #53567 [String] Correct inflection of axis (Vladislav Iurciuc)
bug #53537 [VarDumper] Fix missing colors initialization in CliDumper (@nicolas-grekas)
bug #53481 [Process] Fix executable finder when the command starts with a dash (@kayw-geek)
bug #53006 [ErrorHandler] Don’t format binary strings (@aleho)
bug #53441 [Messenger] Amazon SQS Delay has a max of 15 minutes (@alamirault)
bug #53383 [Validator] re-allow an empty list of fields (@xabbuh)
bug #53418 [FrameworkBundle][Notifier] Fix service registration (MessageBird + TurboSms) (@smnandre)
bug #53350 [Validator] fix the exception being thrown (@xabbuh)
bug #53341 [FrameworkBundle] append instead of replacing potentially non-existent named-arguments (@xabbuh)
bug #53320 [Cache][DependencyInjection][Lock][Mailer][Messenger][Notifier][Translation] Url decode username and passwords from parse_url() results (@alexandre-daubois)
bug #53108 [Serializer] Fix using deserialization path 5.4 (@HypeMC)

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to detect the code you will need to change in your project and
read our upgrade
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