Update Java Native modelEnum.mustache File

Signed-off-by: Chrimle <28791817+Chrimle@users.noreply.github.com>

Author: Chrimle

modules/openapi-generator/src/main/resources/Java/libraries/native/modelEnum.mustache

@@ -17,6 +17,9 @@ import java.util.Locale;
 /**
  * {{description}}{{^description}}Gets or Sets {{{name}}}{{/description}}
  */
+{{#isDeprecated}}
+@Deprecated
+{{/isDeprecated}}
 {{#gson}}
 @JsonAdapter({{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}}.Adapter.class)
 {{/gson}}