[#2387] Downgrade Hibernate Gradle plugin to 7.0.8.Final

The latest Hibernate Gradle plugin requires at list JVM 22.
This downgrade won't affect the released artifact.

Author: DavideD

gradle/libs.versions.toml

@@ -1,7 +1,7 @@
 [versions]
 assertjVersion = "3.27.3"
 hibernateOrmVersion = "7.1.0.CR1"
-hibernateOrmGradlePluginVersion = "7.1.0.CR1"
+hibernateOrmGradlePluginVersion = "7.0.8.Final"
 jacksonDatabindVersion = "2.19.2"
 jbossLoggingAnnotationVersion = "3.0.4.Final"
 jbossLoggingVersion = "3.6.1.Final"