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

docker/personal/fireshare/docker-compose.yml

@@ -1,7 +1,7 @@
 services:
   fireshare:
     container_name: fireshare
-    image: shaneisrael/fireshare:1.8.1-lite
+    image: shaneisrael/fireshare:1.7.4-lite
     ports:
       - "80"
     volumes:

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