feat: updateworkflow-engine-base to 4.0.0 (#25)

[![Mend
Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com)
BREAKING CHANGE: update workflow-engine-base to 4.0.0
This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| ghcr.io/splunk/workflow-engine-base | final | major | `3.0.0` ->
`4.0.0` |

---

### 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 [Mend
Renovate](https://www.mend.io/free-developer-tools/renovate/). View
repository job log
[here](https://developer.mend.io/github/splunk/wfe-test-runner-action).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzNy4zNjMuNSIsInVwZGF0ZWRJblZlciI6IjM3LjM2My41IiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6W119-->

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

Dockerfile

@@ -1,4 +1,4 @@
-FROM ghcr.io/splunk/workflow-engine-base:3.0.0
+FROM ghcr.io/splunk/workflow-engine-base:4.0.0
 
 COPY entrypoint.sh /entrypoint.sh