build(deps): update hashicorp/terraform docker tag to v1.9.4

This MR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [hashicorp/terraform](https://www.terraform.io/) ([source](https://github.com/hashicorp/terraform)) | patch | `1.9.3` -> `1.9.4` |

MR created with the help of [el-capitano/tools/renovate-bot](https://gitlab.com/el-capitano/tools/renovate-bot).

**Proposed changes to behavior should be submitted there as MRs.**

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### Release Notes

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

### [`v1.9.4`](https://github.com/hashicorp/terraform/releases/tag/v1.9.4)

[Compare Source](https://github.com/hashicorp/terraform/compare/v1.9.3...v1.9.4)

##### 1.9.4 (August 7, 2024)

BUG FIXES:

-   core: Unneeded variable validations were being executed during a destroy plan, which could cause plans starting with incomplete state to fail. ([#&#8203;35511](https://github.com/hashicorp/terraform/issues/35511))
-   init: Don't crash when discovering invalid syntax in duplicate required_providers blocks. ([#&#8203;35533](https://github.com/hashicorp/terraform/issues/35533))

</details>

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