Gorm 6.1 JPA @Version duplication

In migrating a grails 3.2.11 app to 3.3.8, which migrates to Gorm 6.1, JPA annotated entities no longer work.

TagLink.groovy
```
import javax.persistence.*;
import javax.validation.constraints.Min;

@Entity
@Table(name = "tag_links")
public class TagLink {
@Id
@Column(name = "id")
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;

@ManyToOne(fetch=FetchType.EAGER, cascade = [CascadeType.REFRESH, CascadeType.PERSIST, CascadeType.MERGE])
@JoinColumn(name = "tag_id")
private Tag tag;

@Column(name = "tag_ref")
@Min(0L)
private Long tagRef;

@Column(name = "type", nullable = false)
private String type;

@Version
private Long version;
...
```

Fails on build with:

The method public java.lang.Long getVersion() { ... } duplicates another method of the same signature
. At [-1:-1] @ line -1, column -1.

All of my JPA entities that have an @Version annotation fail.

I would assume if Gorm 6.1 supports JPA annotations, it should handle the @Version annotation.

Start with the TagLink.groovy example and reproduce the Gorm 6.1 build failure during the Grails 3.3.8 migration. Inspect how JPA entities with @Version are handled and compare the generated getVersion methods. Done means entities using @Version build without the reported duplicate-method error.

Written by the indexing model from the issue text.