Update docker.io/postgres Docker tag to v18

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [harbor.alexlebens.net/images/site-profile](https://gitea.alexlebens.dev/alexlebens/site-profile) | patch | `2.1.1` -> `2.1.2` |

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### Release Notes

<details>
<summary>alexlebens/site-profile (harbor.alexlebens.net/images/site-profile)</summary>

### [`v2.1.2`](https://gitea.alexlebens.dev/alexlebens/site-profile/compare/2.1.1...2.1.2)

[Compare Source](https://gitea.alexlebens.dev/alexlebens/site-profile/compare/2.1.1...2.1.2)

</details>

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### Configuration

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

🚦 **Automerge**: Enabled.

♻ **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.

---

 - [ ] <!-- 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: #2374
Co-authored-by: Renovate Bot <renovate-bot@alexlebens.net>
Co-committed-by: Renovate Bot <renovate-bot@alexlebens.net>

clusters/cl01tl/helm/site-profile/values.yaml

@@ -11,7 +11,7 @@ site-profile:
         main:
           image:
             repository: harbor.alexlebens.net/images/site-profile
-            tag: 2.1.1
+            tag: 2.1.2
             pullPolicy: IfNotPresent
           resources:
             requests:

hosts/ps10rp/gitea/compose.yaml

@@ -19,7 +19,7 @@ services:
             - /dev/net/tun:/dev/net/tun
 
     postgresql:
-        image: docker.io/postgres:17.7-alpine3.21
+        image: docker.io/postgres:18.1-alpine3.21
         container_name: gitea-postgres
         env_file:
             - .env