chore(kube): bump stalwartlabs/stalwart Docker tag to v0.16.21

kubernetes/infrastructure/mail/stalwart/values.yaml

@@ -7,7 +7,7 @@
 # Container image
 image:
     repository: stalwartlabs/stalwart
-    tag: v0.16.20
+    tag: v0.16.21
     pullPolicy: IfNotPresent
 # Single-node RocksDB deployment.
 replicaCount: 1

kubernetes/personal/radicale/release.yaml

@@ -12,7 +12,7 @@ spec:
         name: derwitt
         namespace: radicale
       chart: radicale
-      version: "2.1.1"
+      version: "2.1.0"
       interval: 1m
   valuesFrom:
     - kind: Secret