Update docker.elastic.co/ci-agent-images/quality-gate-seedling Docker tag to v0.0.4 (#183781)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| docker.elastic.co/ci-agent-images/quality-gate-seedling | patch |
`0.0.2` -> `0.0.4` |

---

### 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 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://togithub.com/renovatebot/renovate).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzNy4zNjMuOSIsInVwZGF0ZWRJblZlciI6IjM3LjM2My45IiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6W119-->

Co-authored-by: Renovate Bot <bot@renovateapp.com>

.buildkite/pipelines/quality-gates/pipeline.kibana-tests.yaml

@@ -26,7 +26,7 @@ steps:
       QG_PIPELINE_LOCATION: ".buildkite/pipelines/quality-gates"
     command: "make -C /agent run-environment-tests" # will trigger https://buildkite.com/elastic/kibana-tests
     agents:
-      image: "docker.elastic.co/ci-agent-images/quality-gate-seedling:0.0.2"
+      image: "docker.elastic.co/ci-agent-images/quality-gate-seedling:0.0.4"
 
 notify:
   - slack: "${TEAM_CHANNEL?}"