chore(deps): update prom/prometheus docker tag to v2.55.1 (#403)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| prom/prometheus | minor | `v2.54.1` -> `v2.55.1` |

---

### 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 was generated by [Mend Renovate](https://mend.io/renovate/).
View the [repository job
log](https://developer.mend.io/github/open-feature/playground).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzOS44MC4wIiwidXBkYXRlZEluVmVyIjoiMzkuODAuMCIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOlsicmVub3ZhdGUiXX0=-->

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

docker-compose.yaml

@@ -103,7 +103,7 @@ services:
 
   prometheus:
     container_name: prometheus
-    image: prom/prometheus:v2.54.1
+    image: prom/prometheus:v2.55.1
     restart: always
     volumes:
       - ./config/prometheus/prometheus.yaml:/etc/prometheus/prometheus.yml