chore(helm): update image eclipse-mosquitto digest to 21421af (#32061)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| eclipse-mosquitto | digest | `deae956` -> `21421af` |

---

> [!WARNING]
> Some dependencies could not be looked up. Check the Dependency
Dashboard for more information.

Add the preset `:preserveSemverRanges` to your config if you don't want
to pin your dependencies.

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined),
Automerge - At any time (no schedule defined).

🚦 **Automerge**: Enabled.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

This PR has been generated by [Renovate
Bot](https://redirect.github.com/renovatebot/renovate).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzOS4xNjQuMCIsInVwZGF0ZWRJblZlciI6IjM5LjE2NC4wIiwidGFyZ2V0QnJhbmNoIjoibWFzdGVyIiwibGFiZWxzIjpbImF1dG9tZXJnZSIsInJlbm92YXRlL2NvbnRhaW5lciIsInR5cGUvZGlnZXN0Il19-->

charts/stable/mosquitto/Chart.yaml

@@ -35,4 +35,4 @@ sources:
   - https://github.com/truecharts/charts/tree/master/charts/stable/mosquitto
   - https://hub.docker.com/_/eclipse-mosquitto
 type: application
-version: 16.5.1
+version: 16.5.2

charts/stable/mosquitto/values.yaml

@@ -1,6 +1,6 @@
 image:
   repository: eclipse-mosquitto
-  tag: 2.0.20@sha256:deae95623b9d5c6ca5e264380629db53b992106d436b56d42f7c8df46b41b96f
+  tag: 2.0.20@sha256:21421af7b32bf9ce508e9090c8eb13bb81f410ca778dc205506180a6f862d0eb
   pullPolicy: IfNotPresent
 service:
   main: