chore(helm): update image docker.io/farmos/farmos digest to ac673b1 (#33957)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| docker.io/farmos/farmos | digest | `7992c5a` -> `ac673b1` |

---

> [!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:eyJjcmVhdGVkSW5WZXIiOiIzOS4yMzIuMiIsInVwZGF0ZWRJblZlciI6IjM5LjIzMi4yIiwidGFyZ2V0QnJhbmNoIjoibWFzdGVyIiwibGFiZWxzIjpbImF1dG9tZXJnZSIsInJlbm92YXRlL2NvbnRhaW5lciIsInR5cGUvZGlnZXN0Il19-->

charts/stable/farmos/Chart.yaml

@@ -34,4 +34,4 @@ sources:
   - https://github.com/truecharts/charts/tree/master/charts/stable/farmos
   - https://hub.docker.com/r/farmos/farmos
 type: application
-version: 7.5.3
+version: 7.5.4

charts/stable/farmos/values.yaml

@@ -1,7 +1,7 @@
 image:
   pullPolicy: IfNotPresent
   repository: docker.io/farmos/farmos
-  tag: latest@sha256:7992c5a8ccabd2363baa9aaab1fb874bcefd0a03cb10f43d49566d63dc4a08dc
+  tag: latest@sha256:ac673b1ea672f76ba49fe7acf9043d79354b301682dbdd614f73460bd6af080b
 persistence:
   sitesdirectory:
     enabled: true