v6.1.0

Change log:

af4c7d2 Bring back sshd-sftp-2.9.2
a937d5f Add diagnostics to SftpRemoteFileTemplateTests
e70d0ef Upgrade dependencies; prepare for release
3618965 GH-8623: DefLockRepository: back to LocalDateTime
191f693 Fix memory leak in the FluxMessageChannel
3c0927e GH-8585: Add Javadocs to Pollers & PollerFactory
396f5fb GH-8014: Improve doc for Service Activator
0916945 GH-6827: More XSD docs for SI-ip.xsd
5f1e12e Introduce PartitionedChannel
32b6d82 Fix race condition in testFluxChannelCleanUp
ffe50d2 GH-8613: Add JsonPropertyAccessor type for native
b999ac1 MH: Async by default for reactive output channel
9e7b20a GH-8609: Fix TcpConnectorInterceptor chain propagation
59e676a Demonstrate @Publisher with an @EventListener
90bc65e GH-3866: DefLockRepository: expose query setters
33d13a4 GH-8583: Add Java & DSL samples into docs
212bd46 GH-3763: Add handleReactive() for Java DSL
8291fb9 Fix README for logo and required Java version
49096b3 * Use burrunan/gradle-cache-action got GH actions
75769ba Back to BEFORE_EACH for ImapMailReceiverTests
33aaaba Some ImapMailReceiverTests improvements
e9cee2e Turn on DEBUG for Greenmail to diagnose test fail
1067075 More ImapMailReceiverTests clean-ups
62179bf Bring back IMAP server per unit test
a18a4ca Increase percentage for noDoubleStartForEndpoints
20b6ea6 Fix checkstyle violation in ImapMailReceiverTests
fa1f8a4 Some ImapMailReceiverTests improvements
5e34809 Upgrade to Mockito-5.3.0