Symfony 6.4.6 has just been released.
Here is the list of the most important changes since 6.4.5:

• bug #54400 [HttpClient] stop all server processes after tests have run (@xabbuh)
• bug #54435 [Console] respect multi-byte characters when rendering vertical-style tables (@xabbuh)
• bug #54419 Fix TypeError on ProgressBar (@Fan2Shrek)
• bug #54425 [TwigBridge] Remove whitespaces from block form_help output (@rosier)
• bug #53969 [Mailer] include message id provided by the MTA when dispatching the SentMessageEvent (@xabbuh)
• bug #54315 [Serializer] Fixed BackedEnumNormalizer priority for translatable enum (@IndraGunawan)
• bug #54372 [Config] Fix YamlReferenceDumper handling of array examples (@MatTheCat)
• bug #54362 [Filesystem] preserve the file modification time when mirroring directories (@xabbuh)
• bug #54121 [Messenger] Catch TableNotFoundException in MySQL delete (@acbramley)
• bug #54271 [DoctrineBridge] Fix deprecation warning with ORM 3 when guessing field lengths (@eltharin)
• bug #54306 Throw TransformationFailedException when there is a null bytes injection (@sormes)
• bug #54148 [Serializer] Fix object normalizer when properties has the same name as their accessor (@NeilPeyssard)
• bug #54305 [Cache][Lock] Identify missing table in pgsql correctly and address failing integration tests (@arifszn)
• bug #54199 [Mailer] [Brevo] Check that tags is present in payload before calling setTags (@palgalik)
• bug #54292 [FrameworkBundle] Fix mailer config with XML (@lyrixx)
• bug #54298 [Filesystem] Fix str_contains deprecation (@NeilPeyssard)
• bug #54248 [Security] Correctly initialize the voter property (@aschempp)
• bug #54273 [DependencyInjection] fix XmlDumper when a tag contains also a 'name' property (@lyrixx)
• bug #54191 [Validator] add missing invalid extension error entry (@xabbuh)
• bug #54194 [PropertyAccess] Fix checking for missing properties (@nicolas-grekas)
• bug #54201 [Lock] Check the correct SQLSTATE error code for MySQL (@edomato)
• bug #54252 [Lock] compatiblity with redis cluster 7 (@bastnic)
• bug #54124 [Messenger] trigger retry logic when message is a redelivery (@nikophil)
• bug #54254 [HttpKernel] Fix creating ReflectionMethod with only one argument (@alexandre-daubois)
• bug #54219 [Validator] Allow BICs’ first four characters to be digits (@MatTheCat)
• bug #54239 [Mailer] Fix sendmail transport not handling failure (@aboks)
• bug #54207 [HttpClient] Lazily initialize CurlClientState (@arjenm)
• bug #53865 [Workflow]Fix Marking when it must contains more than one tokens (@lyrixx)
• bug #54137 [Validator] UniqueValidator - normalize before reducing keys (@Brajk19)
• bug #54187 [FrameworkBundle] Fix PHP 8.4 deprecation on ReflectionMethod (@alexandre-daubois)
• bug #54167 [Messenger] [Amqp] Handle AMQPConnectionException when publishing a message. (@jwage)
• bug #54146 [HttpClient] Preserve float in JsonMockResponse (@Jibbarth)

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