Update to Spring Boot 3.5.6

Author: larsgrefer

examples/javadoc/build.gradle

@@ -2,7 +2,7 @@ apply plugin: "java"
 apply plugin: "io.freefair.javadocs"
 
 dependencies {
-    implementation platform("org.springframework.boot:spring-boot-dependencies:2.7.18")
+    implementation platform("org.springframework.boot:spring-boot-dependencies:3.5.6")
     implementation "org.springframework.boot:spring-boot-starter-data-jpa"
     implementation "org.springframework.boot:spring-boot-starter-web"
 }

examples/javadoc/src/main/java/io/freefair/javadoc/Dummy.java

@@ -3,7 +3,7 @@
 import org.hibernate.SessionFactory;
 import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
 
-import javax.persistence.EntityManagerFactory;
+import jakarta.persistence.EntityManagerFactory;
 
 /**
  * Some Documentation {@link String}