Upgrade to Jackson 2.12, Hibernate ORM 5.4.25, Checkstyle 8.38

See gh-25907

build.gradle

@@ -25,7 +25,7 @@ configure(allprojects) { project ->
 
 	dependencyManagement {
 		imports {
-			mavenBom "com.fasterxml.jackson:jackson-bom:2.11.3"
+			mavenBom "com.fasterxml.jackson:jackson-bom:2.12.0"
 			mavenBom "io.netty:netty-bom:4.1.54.Final"
 			mavenBom "io.projectreactor:reactor-bom:2020.0.2-SNAPSHOT"
 			mavenBom "io.r2dbc:r2dbc-bom:Arabba-SR8"
@@ -123,7 +123,7 @@ configure(allprojects) { project ->
 			dependency "net.sf.ehcache:ehcache:2.10.6"
 			dependency "org.ehcache:jcache:1.0.1"
 			dependency "org.ehcache:ehcache:3.4.0"
-			dependency "org.hibernate:hibernate-core:5.4.24.Final"
+			dependency "org.hibernate:hibernate-core:5.4.25.Final"
 			dependency "org.hibernate:hibernate-validator:6.1.6.Final"
 			dependency "org.webjars:webjars-locator-core:0.46"
 			dependency "org.webjars:underscorejs:1.8.3"
@@ -340,7 +340,7 @@ configure([rootProject] + javaProjects) { project ->
 	}
 
 	checkstyle {
-		toolVersion = "8.37"
+		toolVersion = "8.38"
 		configDirectory.set(rootProject.file("src/checkstyle"))
 	}