chore(deps): update step-security/harden-runner action to v2.19.0 (#1015)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
|
[step-security/harden-runner](https://redirect.github.com/step-security/harden-runner)
| action | minor | `v2.18.0` → `v2.19.0` |

---

### Release Notes

<details>
<summary>step-security/harden-runner
(step-security/harden-runner)</summary>

###
[`v2.19.0`](https://redirect.github.com/step-security/harden-runner/releases/tag/v2.19.0)

[Compare
Source](https://redirect.github.com/step-security/harden-runner/compare/v2.18.0...v2.19.0)

##### What's Changed

##### New Runner Support

Harden-Runner now supports Depot, Blacksmith, Namespace, and WarpBuild
runners with the same egress monitoring, runtime monitoring, and policy
enforcement available on GitHub-hosted runners.

##### Automated Incident Response for Supply Chain Attacks

- Global block list: Outbound connections to known malicious domains and
IPs are now blocked even in audit mode.
- System-defined detection rules: Harden-Runner will trigger lockdown
mode when a high risk event is detected during an active supply chain
attack (for example, a process reading the memory of the runner worker
process, a common technique for stealing GitHub Actions secrets).

##### Bug Fixes

Windows and macOS: stability and reliability fixes

**Full Changelog**:
<https://github.com/step-security/harden-runner/compare/v2.18.0...v2.19.0>

</details>

---

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