* Upgrade Spring dependencies to the latest SNAPSHOTs
* Fix tests to verify against stack traces: the message
of the `NestedRuntimeException` does not include the nested exception information.
Related to https://github.com/spring-projects/spring-framework/issues/25162
* Fix `JdbcMessageStore` and `DefaultLockRepository` to rely on the `DataIntegrityViolationException`
instead of only its `DuplicateKeyException` extension.
This is the current behavior of the SQL errors translation
* Disable `WebFluxDslTests.testValidation()` - doesn't subscribe to the reply somehow...
* Refine `SimplePool.PoolSemaphore.reducePermits()`