chore(helm): update image docker.io/bitnami/wordpress digest to 66222d7 (#28358)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
|
[docker.io/bitnami/wordpress](https://redirect.github.com/bitnami/containers)
([source](https://redirect.github.com/bitnami/containers/tree/HEAD/bitnami/wordpress))
| digest | `e4a9bf6` -> `66222d7` |

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:eyJjcmVhdGVkSW5WZXIiOiIzOC4xMzEuMiIsInVwZGF0ZWRJblZlciI6IjM4LjEzMS4yIiwidGFyZ2V0QnJhbmNoIjoibWFzdGVyIiwibGFiZWxzIjpbImF1dG9tZXJnZSIsInJlbm92YXRlL2NvbnRhaW5lciIsInR5cGUvZGlnZXN0Il19-->

charts/stable/wordpress/Chart.yaml

@@ -40,4 +40,4 @@ sources:
   - https://hub.docker.com/r/bitnami/wordpress
   - https://www.wordpress.org
 type: application
-version: 9.7.8
+version: 9.7.9

charts/stable/wordpress/values.yaml

@@ -1,7 +1,7 @@
 image:
   repository: docker.io/bitnami/wordpress
   pullPolicy: IfNotPresent
-  tag: 6.6.2@sha256:e4a9bf6b492d304a1df8d442d63a94826a723e8ac11dcae2340d14c86c01f699
+  tag: 6.6.2@sha256:66222d71928bcbb6114651093a064f56a104b9cf1281810d2206319df645feab
 securityContext:
   container:
     readOnlyRootFilesystem: false