chore(helm): update image docker.io/bitnami/mariadb digest to bfcf892 (#28270)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
|
[docker.io/bitnami/mariadb](https://redirect.github.com/bitnami/containers)
([source](https://redirect.github.com/bitnami/containers/tree/HEAD/bitnami/mariadb))
| digest | `0b22e57` -> `bfcf892` |

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:eyJjcmVhdGVkSW5WZXIiOiIzOC4xMzAuMiIsInVwZGF0ZWRJblZlciI6IjM4LjEzMC4yIiwidGFyZ2V0QnJhbmNoIjoibWFzdGVyIiwibGFiZWxzIjpbImF1dG9tZXJnZSIsInJlbm92YXRlL2NvbnRhaW5lciIsInR5cGUvZGlnZXN0Il19-->

charts/stable/mariadb/Chart.yaml

@@ -37,4 +37,4 @@ sources:
   - https://hub.docker.com/r/bitnami/mariadb
   - https://mariadb.org
 type: application
-version: 15.4.1
+version: 15.4.2

charts/stable/mariadb/values.yaml

@@ -1,7 +1,7 @@
 image:
   repository: docker.io/bitnami/mariadb
   pullPolicy: IfNotPresent
-  tag: 11.5.2@sha256:0b22e57cbb55e002eda38cb781331aee7bfe91931c6c62eec37c970019feb55d
+  tag: 11.5.2@sha256:bfcf892fda619f5cad08b7f901f22862f2bb376e87fb204f312964d2c4ebc501
 
 includeCommon: true
 workload: