GH-198 - Upgrade to Spring Boot 3.1 snapshots.

Switch verification of mock beans as Mockito 5.3.0 uses a different MockMaker by default that doesn't add the explicit interface we have previously checked for.

Remove obsolete init- and destroy method declarations from service bean definitions in examples.

spring-modulith-examples/spring-modulith-examples-epr-mongodb/src/test/java/example/ApplicationIntegrationTests.java

@@ -51,8 +51,8 @@ class ApplicationIntegrationTests {
 	@TestConfiguration
 	static class MongoDbInfrastructureConfiguration {
 
+		@Bean
 		@ServiceConnection
-		@Bean(initMethod = "start", destroyMethod = "stop")
 		MongoDBContainer mongoDBContainer() {
 			return new MongoDBContainer("mongo:6.0.3");
 		}