Bump hashicorp/setup-terraform action from v3 to v4

[dghubble-renovate]

This PR contains the following updates:

Package	Type	Update	Change
hashicorp/setup-terraform	action	major	v3 → v4

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Release Notes

hashicorp/setup-terraform (hashicorp/setup-terraform)

v4

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v4.0.0

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BREAKING CHANGES:

• Upgrade to Node.js 24 - setup-terraform now requires Node.js 24 (#​503)

v3.1.2

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NOTES:

• This release introduces no functional changes. It does however include dependency updates which address upstream CVEs. (#​430)

v3.1.1

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BUG FIXES:

• wrapper: Fix wrapper to output to stdout and stderr immediately when data is received (#​395)

v3.1.0

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ENHANCEMENTS:

• Automatically fallback to darwin/amd64 for Terraform versions before 1.0.2 as releases for darwin/arm64 are not available (#​409)

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