chore(deps): update hashicorp/consul docker tag to v1.21.4 (#495)

Co-authored-by: Renovate Bot <[email protected]>

Author: soerenschneider

apps/consul/sts.yaml

@@ -30,7 +30,7 @@ spec:
           type: RuntimeDefault
       containers:
         - name: "consul"
-          image: "hashicorp/consul:1.21.3"
+          image: "hashicorp/consul:1.21.4"
           imagePullPolicy: "IfNotPresent"
           command:
             - consul