chore: Make user option non-mandatory in FOD issue update command (#1033)

fix: `fcli fod issue update`: Make `--user` option optional

Co-authored-by: mjain6 <mjain6@opentext.com>

Author: jmadhur87

fcli-core/fcli-fod/src/main/java/com/fortify/cli/fod/issue/cli/cmd/FoDIssueUpdateCommand.java

@@ -57,7 +57,7 @@ public class FoDIssueUpdateCommand extends AbstractFoDJsonNodeOutputCommand impl
     @Mixin private FoDReleaseByQualifiedNameOrIdResolverMixin.RequiredOption releaseResolver;
     @Mixin private FoDAttributeUpdateOptions.OptionalAttrOption issueAttrsUpdate;
 
-    @Option(names = {"--user"}, required = true)
+    @Option(names = {"--user"}, required = false)
     protected String user;
     @Option(names = {"--dev-status"}, required = false)
     protected String developerStatus;