chore(deps): update redis docker tag to v21

Author: renovate[bot]

charts/nextcloud/Chart.lock

@@ -7,9 +7,9 @@ dependencies:
   version: 19.1.0
 - name: redis
   repository: oci://registry-1.docker.io/bitnamicharts
-  version: 20.6.1
+  version: 21.1.10
 - name: collabora-online
   repository: https://collaboraonline.github.io/online
   version: 1.1.37
-digest: sha256:86ab70cb28abb7f15d6dc12d58b39a80d5325bf9ceb0959073d0129fd7ad0205
-generated: "2025-04-11T15:44:26.237465393Z"
+digest: sha256:67f7a19812448f3909ab7e1f1bc74d542c0fb09be23f9430eaace48cf85f60b5
+generated: "2025-05-29T19:48:01.772184594Z"

charts/nextcloud/Chart.yaml

@@ -36,7 +36,7 @@ dependencies:
   repository: oci://registry-1.docker.io/bitnamicharts
   condition: mariadb.enabled
 - name: redis
-  version: 20.6.1
+  version: 21.1.10
   repository: oci://registry-1.docker.io/bitnamicharts
   condition: redis.enabled
 - name: collabora-online