Update module github.com/zclconf/go-cty to v1.15.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
github.com/zclconf/go-cty	v1.14.4 -> v1.15.0

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Release Notes

zclconf/go-cty (github.com/zclconf/go-cty)

### [`v1.15.0`](https://redirect.github.com/zclconf/go-cty/compare/v1.14.4...v1.15.0) [Compare Source](https://redirect.github.com/zclconf/go-cty/compare/v1.14.4...v1.15.0)

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Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• [ ] If you want to rebase/retry this PR, check this box

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