Add k9s to dependency update CI (#946)

Author: CloudyBug

.github/workflows/update-dependencies.yml

@@ -165,6 +165,11 @@ jobs:
             repository: k3s-io/k3s
             version_jsonpath: k3s_version
 
+          - key: k9s
+            path: ./roles/k9s/defaults/main.yaml
+            repository: derailed/k9s
+            version_jsonpath: k9s_version
+
           - key: keycloak-operator
             path: ./roles/keycloak/defaults/main.yml
             repository: keycloak/keycloak-k8s-resources