test(deps): update terraform monorepo to v1.15.6 (main)

[renovate]

This PR contains the following updates:

Package	Update	Change
terraform (source)	patch	1.15.5 → 1.15.6

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Release Notes

hashicorp/terraform (terraform)

v1.15.6

Compare Source

1.15.6 (June 10, 2026)

BUG FIXES:

• Fixed an issue where resources being removed from state via removed block were incorrectly listed under planned_values in json representations of the plan file. (#​38665)

• console: Fixed a panic caused by evaluating an expression involving deprecated values (#​38676)

• Fix exit code for plan, query, and refresh commands for variable-related errors (#​38685)

• Fix two module installation edge cases with null and sensitive/ephemeral module sources (#​38704)

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