Symfony 5.4.23 has just been released.
Here is the list of the most important changes since 5.4.22:

bug #50143 [Console] trim(): Argument #1 () must be of type string, bool given (@danepowell)
bug #50066 [Dumper] Trim leading newlines when checking if value begins with a space (@bradtreloar)
bug #50111 Fix the list of supported shells for completions in a phar (@stof)
bug #50074 [Cache] Send Predis SSL options in the $hosts parameter (@magnusnordlander)
bug #50099 [Cache] Fix success interpretation when pruning cache (@staabm)
bug #50092 [Security] Fix return type of AuthenticationSuccessHandlerInterface::onAuthenticationSuccess() (@nicolas-grekas)
bug #50072 [HttpClient] Fix global state preventing two CurlHttpClient instances from working together (@nicolas-grekas)
bug #50017 [Validator] Fix support of Enum to ConstraintValidator::formatValue (@PhoneixS)
bug #49356 [Process] Path resolution changes for PHP in the cgi-fcgi mode (@isdn)
bug #48886 [Console] Fix computing column width containing multibyte chars (@cay89)
bug #50049 [Messenger] Fix deprecation layer of RedeliveryStamp (@nicolas-grekas)
bug #47505 [Mime] Form field values with integer keys not resolved correctly (@claudiu-cristea)
bug #50048 [PhpUnitBridge] Fix PHPUnit 10.1 compatibility (@enumag)
bug #50047 [VarDumper] Make the server TCP connection sync (@ogizanagi)
bug #48837 [Messenger] [Redis] Fixed problem where worker stops handling messages on first empty message (@jvmanji)
bug #49317 [Messenger] Fix warning message on failed messenger show command (@gstapinato)
bug #49992 [Mailer] [Mailjet] Use body MessageID instead of X-MJ-Request-GUID (@Starfox64)
bug #48972 [HttpFoundation] Fix memory limit problems in BinaryFileResponse (@glady)
bug #48108 [PropertyAccess] Readonly properties must have no PropertyWriteInfo (@CasvanDongen)
bug #49009 [Form] Cast choices value callback result to string (@Matth–)
bug #49537 [Serializer] Unexpected value should throw UnexpectedValueException (@ThomasTr)
bug #49581 Avoid leading .. for temporary files from Filesystem recursive remove (@giosh94mhz)
bug #50036 [ErrorHandler] Don’t throw deprecations for HttplugClient (@nicolas-grekas)
bug #50024 [Serializer] Fix denormalization of object with typed constructor arg (not castable) and with COLLECT_DENORMALIZATION_ERRORS (@lyrixx)
bug #50004 [HttpClient] fix proxied redirects in curl client (@matthi4s)
bug #50008 [Intl] Update the ICU data to 73.1 (@jderusse)
bug #49987 [Console] Restoring the ability to output unicode text to the Win10 console (@aleksandr-shevchenko)
bug #49957 [ErrorHandler] Fix sending Vary header with SerializerErrorRenderer (@nicolas-grekas)
bug #49983 [DomCrawler] Avoid passing null to substr/strrpos methods (@VincentLanglet)
bug #49079 [DoctrineBridge] fix issue with missing stopwatch events (@dmaicher)
bug #49926 [HttpClient] Fix canceling MockResponse (@fancyweb)

Want to upgrade to this new release? Because Symfony protects
backwards-compatibility very closely, this should be quite easy. Use
SymfonyInsight upgrade reports
to detect the code you will need to change in your project and
read our upgrade
documentation to learn more.

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