Update hashicorp/terraform Docker tag to v1.9.4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
hashicorp/terraform (source)	stage	patch	1.9.3 -> 1.9.4

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Release Notes

hashicorp/terraform (hashicorp/terraform)

v1.9.4

Compare Source

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. (#​35511)
• init: Don't crash when discovering invalid syntax in duplicate required_providers blocks. (#​35533)

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