Update docker.io/postgres Docker tag to v18

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [generic-device-plugin](https://github.com/bjw-s/helm-charts) ([source](https://github.com/bjw-s/helm-charts/tree/HEAD/charts/library/common)) | minor | `0.19.0` -> `0.20.0` |

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### Configuration

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

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

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

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

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This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
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Reviewed-on: #2012
Co-authored-by: Renovate Bot <renovate-bot@alexlebens.net>
Co-committed-by: Renovate Bot <renovate-bot@alexlebens.net>

clusters/cl01tl/services/generic-device-plugin/Chart.yaml

@@ -15,6 +15,6 @@ maintainers:
 dependencies:
   - name: generic-device-plugin
     repository: https://gitea.alexlebens.dev/api/packages/alexlebens/helm
-    version: 0.19.0
+    version: 0.20.0
 icon: https://cdn.jsdelivr.net/gh/selfhst/icons/png/kubernetes.png
 appVersion: 1.0.0