HHH-19531 Prefer unwrap() to casting sessions in SelectionSpecification/MutationSpecification

Because casts can fail on session proxies, e.g. SessionLazyDelegator, or
Spring's session proxies, or Quarkus'.

Author: yrodiere

hibernate-core/src/main/java/org/hibernate/query/specification/internal/MutationSpecificationImpl.java

@@ -122,7 +122,7 @@ public MutationQuery createQuery(StatelessSession session) {
 	}
 
 	public MutationQuery createQuery(SharedSessionContract session) {
-		final var sessionImpl = (SharedSessionContractImplementor) session;
+		final var sessionImpl = session.unwrap(SharedSessionContractImplementor.class);
 		final SqmDeleteOrUpdateStatement<T> sqmStatement = build( sessionImpl.getFactory().getQueryEngine() );
 		return new QuerySqmImpl<>( sqmStatement, true, null, sessionImpl );
 	}

hibernate-core/src/main/java/org/hibernate/query/specification/internal/SelectionSpecificationImpl.java

@@ -164,7 +164,7 @@ public SelectionQuery<T> createQuery(StatelessSession session) {
 	}
 
 	public SelectionQuery<T> createQuery(SharedSessionContract session) {
-		final var sessionImpl = (SharedSessionContractImplementor) session;
+		final var sessionImpl = session.unwrap(SharedSessionContractImplementor.class);
 		final SqmSelectStatement<T> sqmStatement = build( sessionImpl.getFactory().getQueryEngine() );
 		return new SqmSelectionQueryImpl<>( sqmStatement, true, resultType, sessionImpl );
 	}