Upgrade to Hibernate 6.1.1.Final

This commit makes the following potentially breaking changes:

- Dependency management for modules that do not exist in Hibernate
  6.1 has been removed.
- Hibernate's modules are now in the org.hibernate.orm group. Users
  not using the starter or using modules that are not in the starter
  will have to update their build configuration accordingly.
- spring.jpa.hibernate.use-new-id-generator-mappings has been removed
  as Hibernate no longer supports switching back to the old ID
  generator mappings.

Co-authored-by: Andy Wilkinson <wilkinsona@vmware.com>

Closes gh-31674

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

@@ -45,7 +45,7 @@ dependencies {
 	optional("io.r2dbc:r2dbc-spi")
 	optional("jakarta.servlet:jakarta.servlet-api")
 	optional("org.apache.derby:derbytools")
-	optional("org.hibernate:hibernate-core-jakarta")
+	optional("org.hibernate.orm:hibernate-core")
 	optional("org.springframework:spring-jdbc")
 	optional("org.springframework:spring-orm")
 	optional("org.springframework:spring-web")