Upgrade to Jackson 3.0.0-rc8

Fixes: #10325

* Fix `JacksonMessagingUtilsTests` for compatibility with latest Jackson

Author: artembilan

build.gradle

@@ -69,7 +69,7 @@ ext {
     hsqldbVersion = '2.7.4'
     h2Version = '2.3.232'
     jacksonVersion = '2.19.2'
-    jackson3Version = '3.0.0-rc7'
+    jackson3Version = '3.0.0-rc8'
     jaxbVersion = '4.0.5'
     jcifsVersion = '2.1.40'
     jeroMqVersion = '0.6.0'

spring-integration-core/src/test/java/org/springframework/integration/support/json/JacksonMessagingUtilsTests.java

@@ -122,10 +122,10 @@ void shouldSerializeMimeType() {
 		String json = mapper.writeValueAsString(mimeType);
 
 		assertThat(json).isNotNull();
-		assertThat(json).contains("application\\/json");
+		assertThat(json).contains("application/json");
 	}
 
-	private Set<String> getModuleNames(Collection<JacksonModule> modules) {
+	private static Set<String> getModuleNames(Collection<JacksonModule> modules) {
 		return modules.stream()
 				.map(JacksonModule::getModuleName)
 				.collect(Collectors.toUnmodifiableSet());