v6.0.0-M5

Change log:

145edb2 GH-3872: Docs for PostgresSubscribableChannel
14d8597 GH-3872: Add PostgresSubscribableChannel implementation
695e156 GH-3888: Fix NPE in the RedisLockRegistry.destroy()
ab7b579 Use Testcontainers BOM
036b319 Remove unused import in IntObservZipkinTests
9a54c2d Remove saaj dep: it comes from spring-ws-core
145c845 Fix race condition in the IntObservZipkinTests
91a8b14 Move dependencies to Milestones for release
8c73a2d Add some infrastructure for Observation
5ece0e0 Add Apache Camel support
f39ad6f ZKMetadataStore: Ignore the event for root node
878f8cd Improve some ZK tests
a4997c6 Remove extra root creation in ZKMetadataStore
e527c6e ZKMetadataStore: don't react on the root creation
abd94bd GH-3435: Upgrade to curator-recipes 5.3.0
0f7b3e6 Remove redundant dokkaHtml from build.gradle
4758fa2 Fix STOMP module for latest SF changes
26a4c4d Fix WebSocket module for latest SF
6261980 fix HTTP module according latest SF changes
df1b8b4 GH-3885: Change LockRepository to LocalDateTime
e2a5b7d Improve AOT hints code
47cfae9 Close volatile resource in some Kafka tests
96d3b00 Add @DirtiesContext to a couple Kafka tests
f36181b GH-3660: Invoke well-known lambdas explicitly
1fbfad2 Fix unused import in the ObjToMapTransformerTests
fa85d99 Disable ObjectToMapTransformerTests.cycle test
0e6b70c Disable ObjToMapTransformerParserTests.cycle test
2ecc33e Improve AOT for some infrastructure
15e89c3 Rework infra logic onto IntegrationProperties
8d241c6 Rename CONDITION column to GROUP_CONDITION
8c9662a Expose more AOT hints
5080fc2 GH-3828: Initial Spring AOT support
80eea15 Ignore type in the MessageJacksonDeserializer
ccf41d1 RedisChMessageStore: Add JSON serialization test
56aaa4a Fix Observation test race condition
9c4c528 Fix .gitignore
ef2813c GH-3878: Fix Javadocs for JdbcChannelMessageStore
abac00b Fix flowFromSupplier sample in kotlin-dsl.adoc
ca138c0 GH-3844: Rework messaging annotation with @bean
c1dbb02 GH-3875: Initialize ClassUtils as early as possible
abce38c Fix raw types warn in JmsOutGatewayParserTests
20cebfc GH-3685: Add docs for shared MQTT client feature
2bfcb32 Initial support for Micrometer Observation
78fa297 GH-3873: Remove JMS test for private method
5f12729 GH-3685: Share MQTT connection across components
9996777 Use spring-asciidoctor-backends
690743e Use Global Embedded Kafka whenever possible
5a178de Fix AMQP module for ListenableFuture deprecation
5572c21 Fix deprecations around ListenableFuture
2e9bead GH-3858: Add ImapIdleChASpec.reconnectDelay()
573c297 Fix SIK module for latest SK compatibility
0422486 Fix for latest compatibility