deps: update module github.com/zclconf/go-cty to v1.15.1 (#246)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
|
[github.com/zclconf/go-cty](https://redirect.github.com/zclconf/go-cty)
| `v1.15.0` -> `v1.15.1` |
[![age](https://developer.mend.io/api/mc/badges/age/go/github.com%2fzclconf%2fgo-cty/v1.15.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/go/github.com%2fzclconf%2fgo-cty/v1.15.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/go/github.com%2fzclconf%2fgo-cty/v1.15.0/v1.15.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/go/github.com%2fzclconf%2fgo-cty/v1.15.0/v1.15.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>zclconf/go-cty (github.com/zclconf/go-cty)</summary>

###
[`v1.15.1`](https://redirect.github.com/zclconf/go-cty/compare/v1.15.0...v1.15.1)

[Compare
Source](https://redirect.github.com/zclconf/go-cty/compare/v1.15.0...v1.15.1)

</details>

---

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---

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---

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go.mod

@@ -10,7 +10,7 @@ require (
 	github.com/hetznercloud/hcloud-go/v2 v2.16.0
 	github.com/mitchellh/mapstructure v1.5.0
 	github.com/stretchr/testify v1.9.0
-	github.com/zclconf/go-cty v1.15.0
+	github.com/zclconf/go-cty v1.15.1
 )
 
 require (