chore(terraform-version): update terraform (non-major)

[ppat-self-hosted-renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change	Pending
terraform	tools	patch	1.15.8 → 1.15.9	1.16.0

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Release Notes

hashicorp/terraform (terraform)

v1.15.9

Compare Source

1.15.9 (August 19, 2026)

BUG FIXES:

• validate: Child module validation has been fixed and will now raise errors or warning diagnostics for invalid blocks. (list, import, backend, and cloud) (#​38994)

NOTES:

• Update go-slug to v0.18.3 to mitigate CVE-2026-14978, which is a Unicode normalization issue that could lead to files not being correctly excluded via .terraformignore from upload to a Terraform Enterprise or HCP Terraform during a run (#​39036)

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