chore(deps): update dependency hashicorp/consul to v1.21.4 (#41)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [hashicorp/consul](https://redirect.github.com/hashicorp/consul) |
patch | `1.21.3` -> `1.21.4` |

---

### Release Notes

<details>
<summary>hashicorp/consul (hashicorp/consul)</summary>

###
[`v1.21.4`](https://redirect.github.com/hashicorp/consul/releases/tag/v1.21.4)

[Compare
Source](https://redirect.github.com/hashicorp/consul/compare/v1.21.3...v1.21.4)

##### 1.21.4 (August 13, 2025)

SECURITY:

- security: Update Go to 1.23.12 to address CVE-2025-47906
\[[GH-22547](https://redirect.github.com/hashicorp/consul/issues/22547)]

IMPROVEMENTS:

- ui: Replaced internal code editor with HDS (HashiCorp Design System)
code editor and code block components for improved accessibility and
maintainability across the Consul UI.
\[[GH-22513](https://redirect.github.com/hashicorp/consul/issues/22513)]

BUG FIXES:

- cli: capture pprof when ACL is enabled and a token with operator:read
is used, even if enable\_debug config is not explicitly set.
\[[GH-22552](https://redirect.github.com/hashicorp/consul/issues/22552)]

</details>

---

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.github/workflows/test.yml

@@ -39,7 +39,7 @@ jobs:
           unzip consul.zip
           mv consul /usr/local/bin/
         env:
-          CONSUL_VERSION: 1.21.3 # renovate: datasource=github-releases depName=hashicorp/consul extractVersion=v(?<version>.+)
+          CONSUL_VERSION: 1.21.4 # renovate: datasource=github-releases depName=hashicorp/consul extractVersion=v(?<version>.+)
 
       - uses: hetznercloud/tps-action@main