Upgrade to JUnit Jupiter 5.6.3

Closes gh-23915

spring-boot-project/spring-boot-dependencies/build.gradle

@@ -942,7 +942,7 @@ bom {
 			]
 		}
 	}
-	library("JUnit Jupiter", "5.6.2") {
+	library("JUnit Jupiter", "5.6.3") {
 		group("org.junit") {
 			imports = [
 				"junit-bom"