chore(helm): update image docker.io/cthulhoo/ttrss-fpm-pgsql-static digest to f620c68 (#35918)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| docker.io/cthulhoo/ttrss-fpm-pgsql-static | digest | `a8de423` ->
`f620c68` |

---

> [!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:eyJjcmVhdGVkSW5WZXIiOiIzOS4yMzguMCIsInVwZGF0ZWRJblZlciI6IjM5LjIzOC4wIiwidGFyZ2V0QnJhbmNoIjoibWFzdGVyIiwibGFiZWxzIjpbImF1dG9tZXJnZSIsInJlbm92YXRlL2NvbnRhaW5lciIsInR5cGUvZGlnZXN0Il19-->

charts/stable/tt-rss/Chart.yaml

@@ -37,4 +37,5 @@ sources:
   - https://hub.docker.com/r/cthulhoo/ttrss-fpm-pgsql-static
   - https://hub.docker.com/r/cthulhoo/ttrss-web-nginx
 type: application
-version: 18.5.66
+version: 18.5.68
+

charts/stable/tt-rss/values.yaml

@@ -1,7 +1,7 @@
 image:
   repository: docker.io/cthulhoo/ttrss-fpm-pgsql-static
   pullPolicy: IfNotPresent
-  tag: latest@sha256:a8de4235856e1384d3b2ebf5735508db9f4821f1367d910485e39367a9ac68a5
+  tag: latest@sha256:f620c68424edffd46fdb5aba8ca487db49b247d3fb035e90901274b25af41b83
 nginxImage:
   repository: docker.io/cthulhoo/ttrss-web-nginx
   pullPolicy: IfNotPresent
@@ -9,7 +9,7 @@ nginxImage:
 updaterImage:
   repository: docker.io/cthulhoo/ttrss-fpm-pgsql-static
   pullPolicy: IfNotPresent
-  tag: latest@sha256:a8de4235856e1384d3b2ebf5735508db9f4821f1367d910485e39367a9ac68a5
+  tag: latest@sha256:f620c68424edffd46fdb5aba8ca487db49b247d3fb035e90901274b25af41b83
 securityContext:
   container:
     readOnlyRootFilesystem: false