Symfony 6.3.5 has just been released.
Here is the list of the most important changes since 6.3.4:

bug #51773 [Mailer] [Mailgun] Fix outlook sender (@Romanavr)
bug #50761 [DoctrineBridge] Ignore invalid stores in LockStoreSchemaListener raised by StoreFactory (@alexandre-daubois)
bug #51508 [Messenger] Fix routing to multiple fallback transports (@valtzu)
bug #51468 [Messenger] Fix forced bus name gone after an error in delayed message handling (@valtzu)
bug #51509 [HttpKernel] Fix the order of merging of serializationContext and self::CONTEXT_DENORMALIZE (@pedrocasado)
bug #51701 [Serializer] Fix parsing XML root node attributes (@mtarld)
bug #50787 [Messenger] Fix exiting messenger:failed:retry command (@HypeMC)
bug #49700 [Serializer] Fix reindex normalizedData array in AbstractObjectNormalizer::denormalize() (André Laugks)
bug #51489 [Mime] Fix email (de)serialization issues (@X-Coder264)
bug #51529 [Mailer] [Mailgun] fix parsing of payload timestamp to event date value (DateTimeImmutable) in MailgunPayloadConverter (@ovgray)
bug #51728 [AssetMapper] Fixing jsdelivr regex to catch 2x export syntax in a row (@weaverryan)
bug #51726 [Validator] NoSuspiciousCharacters custom error messages fix (@bam1to)
bug #51588 [FrameworkBundle] Always use buildDir as ConfigBuilderGenerator outputDir (@HypeMC)
bug #51754 [Cache] Fix Redis6Proxy (@nicolas-grekas)
bug #51721 [Notifier][Telegram] Add escaping for slashes (@igrizzli)
bug #51704 [Routing] Fix routing collection defaults when adding a new route to a collection (@bram123)
bug #51675 [Messenger] Fix cloned TraceableStack not unstacking the stack independently (@krciga22)
bug #51198 [DependencyInjection] Fix autocasting null env values to empty string with container.env_var_processors_locator (@fancyweb)
bug #51683 [Cache] Fix support for Redis Sentinel using php-redis 6.0.0 (@Qonstrukt)
bug #51686 [SecurityBundle][PasswordHasher] Fix password migration with custom hasher service with security bundle config (@ogizanagi)
bug #51669 [FrameworkBundle] Handle tags array attributes in descriptors (@fancyweb)
bug #51671 [FrameworkBundle] Fix support for translator.default_path in XML (@HeahDude)
bug #51659 [HttpClient] Fix TraceableResponse if response has no destruct method (@maxhelias)
bug #51629 [Notifier] Fix Smsmode HttpClient mandatory headers (@inwebo)
bug #51674 [Scheduler] Match next run timezone with „from“ timezone (@valtzu)
bug #51598 [Cache] fix using multiple Redis Sentinel hosts when the first one is not resolvable (@digilist)
bug #51497 [FrameworkBundle] no serializer mapping cache in debug mode without enable_annotations (@soyuka)
bug #51645 [String] Update wcswidth data with Unicode 15.1 (@fancyweb)
bug #51586 [ErrorHandler] Handle PHP 8.3 highlight_file function output changes (@PhilETaylor)
bug #47221 [Serializer] Fallback looking for DiscriminatorMap on interfaces (@Caligone)
bug #50794 [TwigBridge] Change return type of SymfonyBridgeTwigAppVariable::getSession() (@Dirkhuethorst)
bug #51568 [Mailer] bug – fix EsmtpTransport variable $code definition (@kgnblg)
bug #51511 [PasswordHasher] Avoid passing null to hash_pbkdf2() (@sdespont)

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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