Fix Java model imports generation for Jakarta

Author: swurzinger

modules/swagger-codegen/src/main/resources/Java/model.mustache

@@ -29,8 +29,8 @@ import android.os.Parcel;
 {{/parcelableModel}}
 {{#useBeanValidation}}
 {{#jakarta}}
-import javax.validation.constraints.*;
-import javax.validation.Valid;
+import jakarta.validation.constraints.*;
+import jakarta.validation.Valid;
 {{/jakarta}}
 {{^jakarta}}
 import javax.validation.constraints.*;