test(deps): update terraform docker tag to v1.15.1 (main)

[renovate]

This PR contains the following updates:

Package	Update	Change
terraform (source)	patch	1.15.0 → 1.15.1

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Release Notes

hashicorp/terraform (terraform)

v1.15.1

Compare Source

1.15.1 (May 1, 2026)

BUG FIXES:

• Fixed crash when configuration has an invalid action_trigger nested block in data or ephemeral lifecycle blocks (#​38402)

• validate: Removed validation of attributes inside backend blocks due to incompatibility with workflows using the -backend-config flag. (#​38466)

• Fix non-const variable checks on init (#​38470)

• Avoid warnings in 'terraform output -raw' (#​38487)

• Ignore undeclared variable values from the cloud backend (#​38490)

• Fix panic for types modules with no expanded instances (#​38491)

• Fixed "unknown provider function" errors occurring during init (#​38472)

• init: Fixed a bug that impacted use of provider pre-releases during init (#​38496)

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