Update ghcr.io/tecnativa/docker-socket-proxy Docker tag to v0.4.2 (#2646)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [ghcr.io/tecnativa/docker-socket-proxy](https://github.com/Tecnativa/docker-socket-proxy) | patch | `v0.4.1` -> `v0.4.2` |

---

### Release Notes

<details>
<summary>Tecnativa/docker-socket-proxy (ghcr.io/tecnativa/docker-socket-proxy)</summary>

### [`v0.4.2`](https://github.com/Tecnativa/docker-socket-proxy/releases/tag/v0.4.2)

[Compare Source](https://github.com/Tecnativa/docker-socket-proxy/compare/v0.4.1...v0.4.2)

#### What's Changed

- Add touch command to create /var/lib/haproxy/server-state by [@&#8203;esabol](https://github.com/esabol) in [#&#8203;163](https://github.com/Tecnativa/docker-socket-proxy/pull/163)

#### New Contributors

- [@&#8203;esabol](https://github.com/esabol) made their first contribution in [#&#8203;163](https://github.com/Tecnativa/docker-socket-proxy/pull/163)

**Full Changelog**: <https://github.com/Tecnativa/docker-socket-proxy/compare/v0.4.1...v0.4.2>

</details>

---

### 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

---

This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0Mi4zOS4xIiwidXBkYXRlZEluVmVyIjoiNDIuMzkuMSIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOlsiYXV0b21lcmdlIiwiaW1hZ2UiXX0=-->

Reviewed-on: #2646
Co-authored-by: Renovate Bot <renovate-bot@alexlebens.net>
Co-committed-by: Renovate Bot <renovate-bot@alexlebens.net>

hosts/ps10rp/homepage/compose.yaml

@@ -20,7 +20,7 @@ services:
             - /dev/net/tun:/dev/net/tun
 
     dockerproxy:
-        image: ghcr.io/tecnativa/docker-socket-proxy:v0.4.1
+        image: ghcr.io/tecnativa/docker-socket-proxy:v0.4.2
         container_name: homepage-dockerproxy
         environment:
             - CONTAINERS=1