kubernetes-sigs: add ArangoGutierrez as nfd admin and maintainer

Add ArangoGutierrez into the admin and maintainers group of the
kubernetes-sigs node-feature-discovery project. He was recently added as
a project approver in kubernetes-sigs/node-feature-discovery#1180.

config/kubernetes-sigs/org.yaml

@@ -1148,11 +1148,13 @@ teams:
   node-feature-discovery-admins:
     description: Admin access to the node-feature-discovery repo
     members:
+    - ArangoGutierrez
     - marquiz
     privacy: closed
   node-feature-discovery-maintainers:
     description: Write access to the node-feature-discovery repo
     members:
+    - ArangoGutierrez
     - marquiz
     privacy: closed
   sig-storage-lib-external-provisioner-admins: