[#2113] Upgrade Hibernate ORM to 7.0.0.Beta4

Among the changes:

* Remove use of FastSessionServices
* Remove classes related to ResolveNaturalIdEvent
* ReactivePersistenceContextAdaptor doesn't extend
  StatefulPersistenceContext anymore (it has changed the scope to
  package)

Author: DavideD

README.md

@@ -37,7 +37,7 @@ Hibernate Reactive has been tested with:
 - CockroachDB v24
 - MS SQL Server 2022
 - Oracle 23
-- [Hibernate ORM][] 7.0.0.Beta3
+- [Hibernate ORM][] 7.0.0.Beta4
 - [Vert.x Reactive PostgreSQL Client](https://vertx.io/docs/vertx-pg-client/java/) 4.5.12
 - [Vert.x Reactive MySQL Client](https://vertx.io/docs/vertx-mysql-client/java/) 4.5.12
 - [Vert.x Reactive Db2 Client](https://vertx.io/docs/vertx-db2-client/java/) 4.5.12

gradle.properties

@@ -35,12 +35,12 @@ org.gradle.java.installations.auto-download=false
 #enableMavenLocalRepo = true
 
 # The default Hibernate ORM version (override using `-PhibernateOrmVersion=the.version.you.want`)
-hibernateOrmVersion = 7.0.0.Beta3
+hibernateOrmVersion = 7.0.0.Beta4
 
 # Override default Hibernate ORM Gradle plugin version
 # Using the stable version because I don't know how to configure the build to download the snapshot version from
 # a remote repository
-hibernateOrmGradlePluginVersion = 7.0.0.Beta2
+#hibernateOrmGradlePluginVersion = 7.0.0.Beta4
 
 # If set to true, skip Hibernate ORM version parsing (default is true, if set to null)
 # this is required when using intervals or weird versions or the build will fail